I’m building an app where users will input their own information and it gets saved. But as the Admin, I can see all of their inputs. How do I set the privacy settings so that it is completely restricted to their eyes only? I need to be able to guarantee that their info is completely secure.
The problem you face is that as the user for the Bubble editor (if that is what you mean by Admins) you can see all of the data - there is the Data tab in the editor - it has create/read/update/delete of all the data in the application. You are effectively a Database Administrator as an application editor.
If you mean as an application user - then privacy rules as @cmarchan suggests is the way forward.