rice/nvim/plugin-confs/lsp-signature.lua

cfg = {
    debug = false, -- set to true to enable debug logging
    log_path = vim.fn.stdpath("cache") .. "/lsp_signature.log", -- log dir when debug is on
    -- default is  ~/.cache/nvim/lsp_signature.log
    verbose = false, -- show debug line number

    bind = true, -- This is mandatory, otherwise border config won't get registered.
    -- If you want to hook lspsaga or other signature handler, pls set to false
    doc_lines = 12, -- will show two lines of comment/doc(if there are more than two lines in doc, will be truncated);
    -- set to 0 if you DO NOT want any API comments be shown
    -- This setting only take effect in insert mode, it does not affect signature help in normal
    -- mode, 10 by default

    floating_window = true, -- show hint in a floating window, set to false for virtual text only mode
    floating_window_above_cur_line = true, -- try to place the floating above the current line when possible Note:
    -- will set to true when fully tested, set to false will use whichever side has more space
    -- this setting will be helpful if you do not want the PUM and floating win overlap

    floating_window_off_x = 1, -- adjust float windows x position.
    floating_window_off_y = -1, -- adjust float windows y position.

    fix_pos = false, -- set to true, the floating window will not auto-close until finish all parameters
    hint_enable = true, -- virtual hint enable
    hint_prefix = " ", -- Panda for parameter
    hint_scheme = "String",
    hi_parameter = "LspSignatureActiveParameter", -- how your parameter will be highlight
    max_height = 15, -- max height of signature floating_window, if content is more than max_height, you can scroll down
    -- to view the hiding contents
    max_width = 85, -- max_width of signature floating_window, line will be wrapped if exceed max_width
    handler_opts = {
        border = "rounded" -- double, rounded, single, shadow, none
    },

    always_trigger = false, -- sometime show signature on new line or in middle of parameter can be confusing, set it to false for #58

    auto_close_after = nil, -- autoclose signature float win after x sec, disabled if nil.
    extra_trigger_chars = {}, -- Array of extra characters that will trigger signature completion, e.g., {"(", ","}
    zindex = 200, -- by default it will be on top of all floating windows, set to <= 50 send it to bottom

    padding = '', -- character to pad on left and right of signature can be ' ', or '|'  etc

    transparency = nil, -- disabled by default, allow floating win transparent value 1~100
    shadow_blend = 36, -- if you using shadow as border use this set the opacity
    shadow_guibg = 'Black', -- if you using shadow as border use this set the color e.g. 'Green' or '#121315'
    timer_interval = 200, -- default timer check interval set to lower value if you want to reduce latency
    toggle_key = nil -- toggle signature on and off in insert mode,  e.g. toggle_key = '<M-x>'
}

-- recommended:
require 'lsp_signature'.setup(cfg) -- no need to specify bufnr if you don't use toggle_key

-- You can also do this inside lsp on_attach
-- note: on_attach deprecated
-- require'lsp_signature'.on_attach(cfg, bufnr) -- no need to specify bufnr if you don't use toggle_key