Hello Someone07 !
1) All menu settings actions can be done in Stuido->Navigation app. Just find a proper menu and add / edit / remove items there. See more details here https://github.com/unaio/una/wiki/Navigation-Builder .
2 and 4) Admin should have own profile.
3) Sorry, this is the part of the core, better to disable the "Visibility" field completely or don't touch it at all.
5) Members may delete their accounts and profiles. Admin may disable accounts via Studio->Accounts app.
6) Settings the limit of likes only via Studio->Permissions area.
7) Can be disabled / edited in Navigation->Perosns->view profile area.
8) By default, there are no similar apps in UNA. You may try to find in our Market - https://una.io/page/products-home
9) In common ways need to keep the sys_options_* and sys_localisation_* tables.