You should be able to access the AP interface via its IP address, which you can find in the T3200 interface.
You could also simply disconnect it, and see what changes or no longer works.
My suggestion is that if you find you don’t need the AP, remove it from your network!
Some devices do not play well with the T3200M. We found iOS devices would not connect to other networked devices, just the internet, so no home sharing, AirPrint, etc, unless using an AP or mesh device.