By default, the platform does not have this option. You can use the following CSS code.
Please follow the steps below:
1. Go to BuddyBoss > Theme Options
2. Under Custom Codes, enable CSS
3. Append the following:
.site-header #primary-navbar .primary-menu .menu-item>.ab-submenu .bb-sub-menu .menu-item a { padding-right: 20px;} /*add codes here*/
4. Save changes.