If I select my chromecast speaker "A" and click on the cast icon again the cast details view is shown.
If I physically change the room and want to switch to the corresponding speaker "B" in MMA I first have the click "stop casting" what closes the cast details view. Then I have to click on the cast icon again and select speaker "B".

I would like it better if I just could switch to speaker "B" without having to first disconnect from speaker "A". That would save me some clicking and would reduce the duration of silence.