Virtually all shortcut key assignments are handled in the Input Gestures dialog of NVDA.
From something once sent to me by Joseph Lee: one would go to NVDA menu/Preferences/Input gestures, expand an add-on category, then expand the unassigned command description and press a hotkey to be used to perform the described command.
In your case you will possibly be dealing with both unassigning and reassigning previously assigned commands for one add-on then assigning for another if you've got multiple add-ons that use the same function key for different functions.
Brian - Windows 10 Pro, 64-Bit, Version 20H2, Build 19042
The depths of denial one can be pushed to by outside forces of disapproval can make you not even recognize yourself to yourself.
~ Brian Vogel