I've always used this code in a must-use plugin to remove the whole color schemes section:

remove_action( 'admin_color_scheme_picker', 'admin_color_scheme_picker' );

Unfortunately, with WordPress 6.0 this does not work anymore. I've found that Core's add_action( 'admin_color_... was recently moved from default-filters.php file to the admin-filters.php file, but I am unsure why and how I'd have to update the above snippet to make it work again.

CodePudding user response：

You can use the other part of the if statement in user-edit.php to remove the ability to change the color scheme.

From user-edit.php

<?php if ( count( $_wp_admin_css_colors ) > 1 && has_action('admin_color_scheme_picker' ) ) : ?>

Although not a direct solution to using the remove action function, you can set the $_wp_admin_css_colors global to an empty array...

add_action( 'admin_init', function () {
    global $_wp_admin_css_colors;
    $_wp_admin_css_colors = [];
} );

CodePudding user response：

For a remove_action() call to be effective, it needs to be called after the action you want to remove has been added, and before the action runs.

WordPress adds the admin_color_scheme_picker action in admin-filters.php and then runs the action in the user-edit.php admin page template.

To remove the admin_color_scheme_picker action right before it is called on the user profile page, you can run the remove_action() call using the admin_head-profile.php hook:

add_action( 'admin_head-profile.php', 'wpse_72463738_remove_admin_color_scheme_picker' );

/**
 * Remove the color picker from the user profile admin page.
 */
wpse_72463738_remove_admin_color_scheme_picker() {
    remove_action( 'admin_color_scheme_picker', 'admin_color_scheme_picker' );
}

Note that the admin_head-{$hook_suffix} hook fires in the head section for a specific admin page. In the example above replacing $hook_suffix with profile.php in the hook name makes it run on the user admin profile page.