New install from iCloud complete, no cannot get out of Settings
iPad Air 4th Gen - new & first install. ios 1503.1. Data downloaded from iCloud, other set up items completed and now can not exit settings.
iPad (4th gen) Wi-Fi
iPad Air 4th Gen - new & first install. ios 1503.1. Data downloaded from iCloud, other set up items completed and now can not exit settings.
iPad (4th gen) Wi-Fi
Try a forced-restart of your iPad:

Try a forced-restart of your iPad:

Hard re-boot worked! Thanks
Noting that iPadOS 15.3 is current, have you actually performed the forced-restart as suggested?
Thanks for the diagram. The device is open and functioning; but, it will not exit from Settings; there seem to be no non-completed tasks.
You are very welcome.
New install from iCloud complete, no cannot get out of Settings