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OxygenOS Volume Button Display When Pressed Jan 20, 2021

I1589373644273 , Jan 20, 2021 :

Usually good at figuring out these things, but this has me stumped:

When using the volume buttons, the display slides out from the left and shows an oblong strip with the obvious volume and sound controls...

HOWEVER, below this, there is a square box with an icon in it that appears to possibly be paper with writing and when pressed will either be active or inactive (the default with a slash).

I have pressed it many times trying to see what effect it has but, so far, it seems to do nothing. Anybody know what this does? Thanx.