Your S7 video looks wrong in that while (for me) the nav bar persists for a few moments, the screen then reads "Shutting down … " for maybe 1.5 seconds and then all is replaced by black and the phone is clearly off after another few moments.
I don’t see that any of the contributors so far have talked of Advanced restart. I stayed on topic and only addressed Power off.
Advanced restart adds to the Restart menu, surly recognisably different from any route to Power off.
Another, different, approach … does your S7 have the latest Samsung firmware revision?
About phone > Android version > Vendor patch level. All S7 on supported /e/OS should share the same date. In this post it was recorded as Apr 1, 2021.