Hide some Admin Bar Items (Search form, notification icon, light/dark switcher)

By default, you will notice 3 icons in the top right corner you called Search, Notification, and Dark light switcher. 

If you think any icon is irrelevant to you, then just hide a specific icon from the Customize option panel. 

There are some options called Search Form, Notifications Icon, and Light/Dark Switcher. All these option has a show/hide switcher. 

Just show or hide any icon based on your preference.