Turntable is connected to Sonos Port via external amp, and I managed to enjoy first album.  However, both on my phone Sonos app and the Sonos app on pc, I cannot get the source to change back to streaming music - it remains on turntable.  Any suggestions?  I can unplug the Port, but is there not a way to change the source back to stream music from turntable, and back?

Thank you in advance for any solutions or advice.

FYI - I have multiple Sonos (Play 3, multiple Play One’s, Sonos Move).