Why is everyone who is complaining about this icon issue with iPadOS 15, just use the Zoom feature in Accesibility?
This IS a completely valid workaround, for the time being.
I use the on screen button Zoom controls and they work well enough.
You can, also, access the same controls from the Zoom window button/bar on the lower bar at the bottom middle of the actual Zoom window.
You can make that window any size you need at any magnification needed.
You CAN dismiss the Zoom feature/window any time it is not needed.
This is a very flexible feature and it works!
I have a iPad Pro and use this feature a lot, now, since I am getting older and my eyesight is getting worse.
Everyone who dismisses this Zoom feature thinks that this is an all or nothing feature.
The Zoom feature is a very flexible one and a feature that CAN be dismissed at any time.
The ONLY real hassle is finding a good place onscreen for the Zoom feature button controls, so you do not always accidentally hit the Zoom button all the time.
This is a perfectly valid workaround that works.