my-nvim-setup/lua/plugins/toggleterm.lua

local present, toggleterm = pcall(require, "toggleterm")
if not present then
    return
end

toggleterm.setup {
      -- size can be a number or function which is passed the current terminal
    size = function(term)
        if term.direction == "horizontal" then
            return 15
        elseif term.direction == "vertical" then
            return vim.o.columns * 0.4
        end
    end,
    -- open_mapping = [[<C-\>]], -- mapping set in mappings.lua
    hide_numbers = true, -- hide the number column in toggleterm buffers
    shade_terminals = false,
    start_in_insert = true,
    -- insert_mappings = true, -- see 'open_mapping', not set on purpose
        -- whether or not the open mapping applies in insert mode
    persist_size = true,
    direction = 'vertical',
    close_on_exit = true, -- close the terminal window when the process exits
    -- This field is only relevant if direction is set to 'float'
    float_opts = {
        border = 'single',
        winblend = 0,
        highlights = {
            border = "Normal",
            background = "Normal",
        }
    }
}