page-specific-settings

How can I get all my website pages to show in the Word Press dashboard?

Setting admin submenu appears only when I cliked on a custom link

I have copied and pasted your code to function.php but it turned out to be no categories shown. Please see screenshot here – https://ibb.co/gZt2zQF . Anything wrong with the code? Can anyone else help?

You can do that easily using a plugin like: https://wordpress.org/plugins/user-role-editor/