Screen recording not working on iPadOS 13?
Check how much free storage space do you have available on your iPad. If your iPad is low on storage space, screen recording and video capture via the camera app is disabled by iOS.
You can check for the amount of free storage space available on your device by going to Settings app → General → iPad Storage.
You can re-enable screen recording by freeing up space on your iPad which could be done via the iPad Storage section.