nvim/lua/plugs/toggleterm.lua

return {
  -- amongst your other plugins
  { 'akinsho/toggleterm.nvim',
    version = "*",
    config = function ()
      require("toggleterm").setup{
        -- size can be a number or function which is passed the current terminal
        size = 10,
        open_mapping = [[<c-\>]],
        hide_numbers = true, -- hide the number column in toggleterm buffers
        shade_filetypes = {},
        shade_terminals = true,
        shading_factor = 1, -- the degree by which to darken to terminal colour, default: 1 for dark backgrounds, 3 for light
        start_in_insert = true,
        insert_mappings = true, -- whether or not the open mapping applies in insert mode
        persist_size = true,
        direction = 'horizontal',
      }
    end
  },

}