My ipad pro is stuck on some kind of app that just shows a white screen with a single black swipe line at the bottom. Swiping does not work nor does the usual shut down processes?

Here’s how to deal with such a problem Try doing following steps

• Learn what to do if you iPad is frozen or won’t turn on https://support.apple.com/en-us/HT201412
• Try Force restart https://support.apple.com/en-us/HT210631
• Try back up and Restoring https://support.apple.com/en-us/HT201263
• If back up fails on iCloud https://support.apple.com/en-us/HT201263
• Restore all content lost in this process https://support.apple.com/guide/ipad/restore-all-content-from-a-backup-ipad9a74c804/ipados
• Try this if you can’t restore https://support.apple.com/en-us/HT201263
• If None of this helps contact Apple Support they will be able to help you better in this case click on Apple support button on the top right hand corner

If it doesn’t force restart wait till the battery drains out or contact Apple support for a quicker response

Contact Apple support directly.

Yes try these steps these will help

No the force restart