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To hide admin bar in front end, we put code in functions.php

//hide admin bar

    add_filter('show_admin_bar', '__return_false');

//or hook action

    function remove_admin_bar() {
            show_admin_bar( false );
    }
    add_action('after_setup_theme','remove_admin_bar');

but how to disable or customize admin bar (wpadminbar) in back-end.

1

To disable (or in the case which I show below with code, hiding) the adminbar in the back-end you could use following code snippet.

Please always backup functions.php before editing/adding code.

I added also a capability so the adminbar is still visible for the admin.
(which you can remove if wish by removing !current_user_can( 'manage_options' ) && or whatever you want to do with it (look here for other roles/capabilities, to understand all a little more) )

/**
 * Hide the Toolbar(adminbar) in the back-end using CSS
 * 
 * @version WP 4.8
 * Read more {@link https://codex.wordpress.org/Roles_and_Capabilities#Capabilities}
 *           {@link https://codex.wordpress.org/Function_Reference/is_admin}
 *           {@link https://codex.wordpress.org/Function_Reference/current_user_can}
 */
if ( !current_user_can( 'manage_options' ) && is_admin() )
{
    function wpse271937_hide_adminbar()
    {
        ?>
        <style>
            #wpadminbar {
                display: none;
            }
            #wpwrap {
                top: -30px;/** change to own preference */
            } 
        </style>
        <?php
    }
    add_action('admin_head', 'wpse271937_hide_adminbar'); 
}

To customize the adminbar I leave that to your own preferences, but you can for sure take a look here or maybe in the Codex itself.

Take also a look at these:

I hope this helps you on your way.

Note: the Screen Options and Help tab are with the function as shown above still visible which imho is important. Of course is it also possible to hide/remove them with a (seperate) function.

| improve this answer | |
  • Thank you! It's working when hiding it with css code..Generatewp.com is the good page for rendering code automatically. – Rei Jul 1 '17 at 6:22
  • @Rei, would be nice to see the answer be accepted so this topic can be closed. – Charles Jul 3 '17 at 17:16
  • Yes. It's solved – Rei Jul 4 '17 at 2:55

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