I just updated to version 15.1.1.
I now notice, that the entire screen on my iPad goes dark, when I adjust the volume.
Is this a new feature or a bug or have I not noticed this before ? 
S2 version 15.1.1
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Hi
Thanks for your post!
It is definitely not a bug - more a design choice - and although I cannot say for sure if it has always happened, I’m sure it is not at all new with this particular update.
I hope this helps.
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