I have more than one pair of running shoes in active use - currently I'm breaking in a new pair, so I'm mostly using them on short recovery runs. When I'm done with a run, I review the activity on the mobile app (Android in my case) but I cannot change the gear from the activity's default. It is possible to manage gear (i.e. add new gear) but I can't change what was used.
I know this functionality is available by going online and editing the activity there, but that's not convenient, esp when I'm away from my PC for extended periods (holiday, travel).