Mark items visible only to Admin while logged in as Admin
Suggestions
Sorry for the delay responding here.
The easiest way to do this is just to have two different browsers open and be logged in as admin on one of them, and as a user on the other, then just switch between them. I often have several browsers open at the same time (Firefox, Chrome, Safari, Brave etc.) for development that needs multiple users to test things out.
I have seen a Firefox plugin that does allow for different user sessions on different browser tabs so that may be an alternative approach, but its essentially the same thing as multi browsers.
hth