SETUP ADMIN BAR
1. Log in to the Admin dashboard.
2. Go to themes.
3. Click the Customize button.
4. Navigate to the Main Menu and on the Sections tab, click on the Action bar option if it's already added, but if it's not. Scroll down and click Add Section button as per screenshots below:
5. In the Action Bar option panel, click on the Select menu button.
6. Inside Select menu option panel, choose the menu you wanted to be displayed on the admin bar or you can create a new one by clicking the Create menu link. Once your selected menu is set then click save.