Need more information about HIDE ADMIN BAR

Valued Support Team,

within the setting option of Protected Content it is possible to HIDE Admin bar. This is a bit confusing and I need to have more explanation on that too.

Question:
After signing up for a membership (e.g. GOLD level) does such member have access to BACKEND means they don't stay on FRONTEND level?

Please explain bit more.
Thank you.
Prinz