That volume control icon is supposed to appear only for a few seconds after adjusting the volume controls or activating the mute control. It's not supposed to stay permanently onscreen.
If yours stays permanently visible, it's not operating correctly.
Agreed. It should not stay on the screen for more than a couple of seconds.Yep 100%
Mine appears for maybe 4 or 5 seconds then closes.
I'd try a reset and see if it makes a difference.