nvim2023/after/plugin/zenmode.lua

require("zen-mode").setup {
  -- your configuration comes here
  -- or leave it empty to use the default settings
  -- refer to the configuration section below
}

vim.keymap.set("n", "<leader>z", function()
  require("zen-mode").toggle({
    window = {
      width = 90
    },
    on_open = function(win)
      vim.o.wrap = true
      vim.o.relativenumber = false
    end,
    -- callback where you can add custom code when the Zen window closes
    on_close = function()
      vim.o.wrap = false
      vim.o.relativenumber = true
    end,
  })
end)