How to remove WP Admin panel NAGs and Adverts

[Community]

THere are a few plugins availiable for this, such as :

Disable Admin Notices individually

Disable admin notices plugin gives you the option to hide updates warnings and inline notices in the admin panel.

wordpress.org

We personally use a plugin called clarity for most of the NAGs and plugin notifications, just install and let it do its thing.

Clarity - Ad, banner and upsell blocker for WordPress

Clarity is a lightweight WordPress plugin that works just like your favourite browser ad blocker. It surgically removes ads, upsells and other annoying notifications such banners asking to track you.

wp-clarity.dev

There are other options too such as this code snippet:

Add Code to the Theme's functions.php​

1. Go to Appearance > Theme Editor in the WordPress admin panel.
2. Open the functions.php file of your active theme.
3. Add the following code to hide admin notices for all users:

 function remove_admin_notices_for_all_users(){if (!current_user_can('manage_options')){remove_all_actions('admin_notices');
        remove_all_actions('all_admin_notices');
    }
}
add_action('admin_head', 'remove_admin_notices_for_all_users', 1);