How to Hide the Admin Toolbar for WordPress Users
WordPress sites display an admin toolbar for all logged-in users. This is visible on the frontend of your site and also in the WordPress admin area.
This toolbar contains shortcuts to key features in WordPress. A user in the Subscriber role will only see a few features. A user in the Administrator role may see a very busy toolbar, particularly on a site with many plugins. This image below shows my toolbar here at PublishPress.com: