To enable missing BuddyBoss-related menus, please follow the steps below:
1. First, check if the BuddyBoss menu is available by navigating to the WordPress dashboard – Appearance – Menus – Add menu items section.

2. You may enable it by first clicking on the Screen Options on the upper right side of the Appearance – Menu page.

3. Enable the BuddyBoss screen elements by checking the checkbox beside the screen elements. See the image below:

4. The BuddyBoss menus should now appear under the Add menu items section.
