There is nothing you can do to end the connection manually - you have to return to the Home screen, close the app and reopen. It's annoying.
Though, you can also just end the remote play session from the PS5 side and it'll kick you back to the...
Are there button combinations to bring a menu or to close the connection? I cant find this info anywhere, also the touch pad from the ps controller how can i emulate a press?
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This is most likely your connection to your wifi