diff --git a/config.example.jsonc b/config.example.jsonc
index 198219c2..ffd234f1 100644
--- a/config.example.jsonc
+++ b/config.example.jsonc
@@ -194,11 +194,6 @@
         "axisIndex": 1, // Raw axis index captured for this analog controller action.
         "dpadFallback": "vertical" // Optional D-pad fallback used when this analog controller action should also read D-pad input. Values: none | horizontal | vertical
       }, // Axis binding descriptor used for primary popup scrolling. Use Alt+C learn mode or set a raw axis descriptor manually.
-      "rightStickHorizontal": {
-        "kind": "axis", // Analog binding input source kind. Values: none | axis
-        "axisIndex": 3, // Raw axis index captured for this analog controller action.
-        "dpadFallback": "none" // Optional D-pad fallback used when this analog controller action should also read D-pad input. Values: none | horizontal | vertical
-      }, // Axis binding descriptor reserved for alternate right-stick mappings. Use Alt+C learn mode or set a raw axis descriptor manually.
       "rightStickVertical": {
         "kind": "axis", // Analog binding input source kind. Values: none | axis
         "axisIndex": 4, // Raw axis index captured for this analog controller action.
diff --git a/docs-site/public/config.example.jsonc b/docs-site/public/config.example.jsonc
index 198219c2..ffd234f1 100644
--- a/docs-site/public/config.example.jsonc
+++ b/docs-site/public/config.example.jsonc
@@ -194,11 +194,6 @@
         "axisIndex": 1, // Raw axis index captured for this analog controller action.
         "dpadFallback": "vertical" // Optional D-pad fallback used when this analog controller action should also read D-pad input. Values: none | horizontal | vertical
       }, // Axis binding descriptor used for primary popup scrolling. Use Alt+C learn mode or set a raw axis descriptor manually.
-      "rightStickHorizontal": {
-        "kind": "axis", // Analog binding input source kind. Values: none | axis
-        "axisIndex": 3, // Raw axis index captured for this analog controller action.
-        "dpadFallback": "none" // Optional D-pad fallback used when this analog controller action should also read D-pad input. Values: none | horizontal | vertical
-      }, // Axis binding descriptor reserved for alternate right-stick mappings. Use Alt+C learn mode or set a raw axis descriptor manually.
       "rightStickVertical": {
         "kind": "axis", // Analog binding input source kind. Values: none | axis
         "axisIndex": 4, // Raw axis index captured for this analog controller action.
diff --git a/src/config/config.test.ts b/src/config/config.test.ts
index faf81bc9..a17f00b8 100644
--- a/src/config/config.test.ts
+++ b/src/config/config.test.ts
@@ -1297,7 +1297,6 @@ test('parses controller settings with logical bindings and tuning knobs', () =>
           "toggleMpvPause": "leftStickPress",
           "leftStickHorizontal": "rightStickX",
           "leftStickVertical": "rightStickY",
-          "rightStickHorizontal": "leftStickX",
           "rightStickVertical": "leftStickY"
         }
       }
diff --git a/src/config/definitions/defaults-core.ts b/src/config/definitions/defaults-core.ts
index 24e4b95d..4c1ccd43 100644
--- a/src/config/definitions/defaults-core.ts
+++ b/src/config/definitions/defaults-core.ts
@@ -92,7 +92,6 @@ export const CORE_DEFAULT_CONFIG: Pick<
       playNextSubtitle: { kind: 'none' },
       leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
       leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-      rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
       rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
     },
     reviewBindings: getDefaultControllerReviewBindings(),
diff --git a/src/config/definitions/options-core.ts b/src/config/definitions/options-core.ts
index faa4307e..9a7abf20 100644
--- a/src/config/definitions/options-core.ts
+++ b/src/config/definitions/options-core.ts
@@ -125,11 +125,6 @@ export function buildCoreConfigOptionRegistry(
       defaultValue: defaultConfig.controller.bindings.leftStickVertical,
       description: 'Axis binding descriptor used for primary popup scrolling.',
     },
-    {
-      id: 'rightStickHorizontal',
-      defaultValue: defaultConfig.controller.bindings.rightStickHorizontal,
-      description: 'Axis binding descriptor reserved for alternate right-stick mappings.',
-    },
     {
       id: 'rightStickVertical',
       defaultValue: defaultConfig.controller.bindings.rightStickVertical,
diff --git a/src/config/resolve/controller.ts b/src/config/resolve/controller.ts
index 12cb1469..44d78953 100644
--- a/src/config/resolve/controller.ts
+++ b/src/config/resolve/controller.ts
@@ -70,7 +70,6 @@ const CONTROLLER_BUTTON_INDEX_KEY_BY_BINDING: Record<
 const CONTROLLER_AXIS_FALLBACK_BY_SLOT = {
   leftStickHorizontal: 'horizontal',
   leftStickVertical: 'vertical',
-  rightStickHorizontal: 'none',
   rightStickVertical: 'none',
 } as const satisfies Record<string, ControllerDpadFallback>;
 
@@ -111,7 +110,6 @@ const CONTROLLER_DISCRETE_BINDING_KEYS = [
 const CONTROLLER_AXIS_BINDING_KEYS = [
   'leftStickHorizontal',
   'leftStickVertical',
-  'rightStickHorizontal',
   'rightStickVertical',
 ] as const;
 
diff --git a/src/core/services/ipc.test.ts b/src/core/services/ipc.test.ts
index 5cb7e1eb..5e02dfe3 100644
--- a/src/core/services/ipc.test.ts
+++ b/src/core/services/ipc.test.ts
@@ -87,7 +87,6 @@ function createControllerConfigFixture() {
         dpadFallback: 'horizontal' as const,
       },
       leftStickVertical: { kind: 'axis' as const, axisIndex: 1, dpadFallback: 'vertical' as const },
-      rightStickHorizontal: { kind: 'axis' as const, axisIndex: 3, dpadFallback: 'none' as const },
       rightStickVertical: { kind: 'axis' as const, axisIndex: 4, dpadFallback: 'none' as const },
     },
     reviewBindings: getDefaultControllerReviewBindings(),
diff --git a/src/renderer/modals/controller-binding-issues.test.ts b/src/renderer/modals/controller-binding-issues.test.ts
index 93bf477c..13ecd0dd 100644
--- a/src/renderer/modals/controller-binding-issues.test.ts
+++ b/src/renderer/modals/controller-binding-issues.test.ts
@@ -118,14 +118,6 @@ test('two stick actions on the same stick both warn', () => {
   );
 });
 
-test('Alt Horizontal does nothing, so it never clashes', () => {
-  // On standard pads the right stick's vertical axis is 3, the default of Alt Horizontal.
-  assert.deepEqual(
-    issuesWith({ rightStickVertical: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' } }),
-    {},
-  );
-});
-
 test('a row shared by several actions lists them all', () => {
   assert.equal(
     issuesWith({
diff --git a/src/renderer/modals/controller-binding-issues.ts b/src/renderer/modals/controller-binding-issues.ts
index d2495957..e8c4e0ec 100644
--- a/src/renderer/modals/controller-binding-issues.ts
+++ b/src/renderer/modals/controller-binding-issues.ts
@@ -17,12 +17,6 @@ export type ControllerBindingIssueDefinition = {
   bindingType: 'discrete' | 'axis';
 };
 
-/**
- * Rows that do nothing in SubMiner: no action reads `rightStickHorizontal`, so it cannot
- * clash with anything.
- */
-const INACTIVE_BINDINGS: ReadonlySet<ControllerBindingActionId> = new Set(['rightStickHorizontal']);
-
 /** Row key of a stick binding's D-pad row in Alt+C. */
 export function getControllerDpadRowKey(actionId: ControllerBindingActionId): string {
   return `${actionId}:dpad`;
@@ -83,7 +77,6 @@ export function findControllerBindingIssues(
   const holdActions = new Map<string, string>();
   const rows: { key: string; label: string; inputs: string[] }[] = [];
   for (const definition of definitions) {
-    if (INACTIVE_BINDINGS.has(definition.id)) continue;
     const binding = bindings[definition.id];
     if (!binding) continue;
     if (definition.bindingType === 'axis') {
diff --git a/src/renderer/modals/controller-config-form.test.ts b/src/renderer/modals/controller-config-form.test.ts
index a5096be6..b8487409 100644
--- a/src/renderer/modals/controller-config-form.test.ts
+++ b/src/renderer/modals/controller-config-form.test.ts
@@ -31,7 +31,6 @@ const BINDINGS: ResolvedControllerConfig['bindings'] = {
   playNextSubtitle: { kind: 'none' },
   leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
   leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-  rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
   rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
 };
 
@@ -188,15 +187,13 @@ test('controller config form renders grouped rows with friendly binding labels',
       ['Token Move (D-pad)', 'D-pad ↔'],
       ['Popup Scroll (Stick)', 'Left Stick Y'],
       ['Popup Scroll (D-pad)', 'D-pad ↕'],
-      ['Alt Horizontal (Stick)', 'Right Stick X'],
-      ['Alt Horizontal (D-pad)', 'None'],
       ['Popup Jump (Stick)', 'Right Stick Y'],
       ['Popup Jump (D-pad)', 'None'],
     ],
   );
   assert.deepEqual(
     findAll(container, 'disabled').map((badge) => badge.textContent),
-    ['None', 'None', 'None', 'None', 'None', 'None', 'None', 'None', 'None', 'None', 'None'],
+    ['None', 'None', 'None', 'None', 'None', 'None', 'None', 'None', 'None', 'None'],
   );
   assert.deepEqual(findAll(container, 'expanded'), []);
   assert.deepEqual(findAll(container, 'controller-config-edit-panel'), []);
diff --git a/src/renderer/modals/controller-config-form.ts b/src/renderer/modals/controller-config-form.ts
index 0d22ea47..8fb779d1 100644
--- a/src/renderer/modals/controller-config-form.ts
+++ b/src/renderer/modals/controller-config-form.ts
@@ -178,13 +178,6 @@ export const CONTROLLER_BINDING_DEFINITIONS: ControllerBindingDefinition[] = [
     bindingType: 'axis',
     defaultBinding: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
   },
-  {
-    id: 'rightStickHorizontal',
-    label: 'Alt Horizontal',
-    group: 'Navigation',
-    bindingType: 'axis',
-    defaultBinding: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
-  },
   {
     id: 'rightStickVertical',
     label: 'Popup Jump',
diff --git a/src/renderer/modals/controller-debug.test.ts b/src/renderer/modals/controller-debug.test.ts
index 96052b38..a687a278 100644
--- a/src/renderer/modals/controller-debug.test.ts
+++ b/src/renderer/modals/controller-debug.test.ts
@@ -84,7 +84,6 @@ test('controller debug modal renders active controller axes, buttons, and config
         playNextSubtitle: { kind: 'none' },
         leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
         leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-        rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
         rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
       },
       reviewBindings: getDefaultControllerReviewBindings(),
@@ -210,7 +209,6 @@ test('controller debug modal copies buttonIndices config to clipboard', async ()
         playNextSubtitle: { kind: 'none' },
         leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
         leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-        rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
         rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
       },
       reviewBindings: getDefaultControllerReviewBindings(),
@@ -335,7 +333,6 @@ test('controller debug modal stays closed and notifies when controller support i
         playNextSubtitle: { kind: 'none' },
         leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
         leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-        rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
         rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
       },
       reviewBindings: getDefaultControllerReviewBindings(),
diff --git a/src/renderer/modals/controller-select.test.ts b/src/renderer/modals/controller-select.test.ts
index 18f0435e..78ed7536 100644
--- a/src/renderer/modals/controller-select.test.ts
+++ b/src/renderer/modals/controller-select.test.ts
@@ -170,7 +170,6 @@ function buildContext() {
       playNextSubtitle: { kind: 'none' },
       leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
       leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-      rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
       rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
     },
     reviewBindings: getDefaultControllerReviewBindings(),
diff --git a/src/renderer/modals/controller-select.ts b/src/renderer/modals/controller-select.ts
index 99c5d0a2..a6145f3d 100644
--- a/src/renderer/modals/controller-select.ts
+++ b/src/renderer/modals/controller-select.ts
@@ -230,7 +230,6 @@ export function createControllerSelectModal(
         playNextSubtitle: { kind: 'none' },
         leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
         leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-        rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
         rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
       },
     getScreenGroups: () => {
diff --git a/src/renderer/renderer.ts b/src/renderer/renderer.ts
index b8208a47..36ca8ce4 100644
--- a/src/renderer/renderer.ts
+++ b/src/renderer/renderer.ts
@@ -590,7 +590,6 @@ function startControllerPolling(): void {
             playNextSubtitle: { kind: 'none' },
             leftStickHorizontal: { kind: 'axis', axisIndex: 0, dpadFallback: 'horizontal' },
             leftStickVertical: { kind: 'axis', axisIndex: 1, dpadFallback: 'vertical' },
-            rightStickHorizontal: { kind: 'axis', axisIndex: 3, dpadFallback: 'none' },
             rightStickVertical: { kind: 'axis', axisIndex: 4, dpadFallback: 'none' },
           },
           reviewBindings: getDefaultControllerReviewBindings(),
diff --git a/src/shared/ipc/validators.ts b/src/shared/ipc/validators.ts
index 45e24a6a..eb08d50f 100644
--- a/src/shared/ipc/validators.ts
+++ b/src/shared/ipc/validators.ts
@@ -217,12 +217,7 @@ function parseControllerBindings(value: unknown): ControllerConfigUpdate['bindin
     if (!parsed) return null;
     bindings[key] = parsed as NonNullable<ControllerConfigUpdate['bindings']>[typeof key];
   }
-  const axisKeys = [
-    'leftStickHorizontal',
-    'leftStickVertical',
-    'rightStickHorizontal',
-    'rightStickVertical',
-  ] as const;
+  const axisKeys = ['leftStickHorizontal', 'leftStickVertical', 'rightStickVertical'] as const;
   for (const key of axisKeys) {
     if (value[key] === undefined) continue;
     const parsed = parseAxisBinding(value[key]);
diff --git a/src/types/runtime.ts b/src/types/runtime.ts
index 09c6fede..18ef660a 100644
--- a/src/types/runtime.ts
+++ b/src/types/runtime.ts
@@ -253,7 +253,6 @@ export interface ControllerBindingsConfig {
   playNextSubtitle?: ControllerDiscreteBindingConfig;
   leftStickHorizontal?: ControllerAxisBindingConfig;
   leftStickVertical?: ControllerAxisBindingConfig;
-  rightStickHorizontal?: ControllerAxisBindingConfig;
   rightStickVertical?: ControllerAxisBindingConfig;
 }
 
@@ -277,7 +276,6 @@ export interface ResolvedControllerBindingsConfig {
   playNextSubtitle?: ResolvedControllerDiscreteBinding;
   leftStickHorizontal?: ResolvedControllerAxisBinding;
   leftStickVertical?: ResolvedControllerAxisBinding;
-  rightStickHorizontal?: ResolvedControllerAxisBinding;
   rightStickVertical?: ResolvedControllerAxisBinding;
 }