If your iPad isn’t working right, try restarting it.
To turn off iPad, do one of the following:
On an iPad with a Home button: Press and hold the top button, then drag the slider.
All models: Go to Settings > General > Shut Down, then drag the slider.
To turn iPad back on, press and hold the top button until the Apple logo appears.
https://support.apple.com/guide/ipad/restart-ipad-ipad63d30b5a/14.0/ipados/14.0