Reported Bug IOS-26. Here is a screenshot of the problem.

[transmaster]

With iOS 26.0 I had this pop up.

This control is normally toggleable from the pull-down controls or in the Control window. None of the settings have any effect on this control. You cannot close it or move it. I was bumped up the ladder at Apple Support, and they could find no solution to this problem. The control that should allow you to control this doesn't work. Because I cannot control it, it covers up controls that slide down in that corner.

If any of you have this problem, Apple would like to hear about it.

 

[hg.wells]

Can you not adjust it with the volume buttons on your keyboard?

I’m guessing you’ve also tried a restart.

 

[transmaster]

Can you not adjust it with the volume buttons on your keyboard?

I’m guessing you’ve also tried a restart.

I have performed a restart and a full reboot multiple times, but the control still does not work. In the main control screen, none of the controls work there either. It does not function as a volume control either.