You appear to have arrived here from this Apple support page:
Organize the Home Screen and App Library on your iPhone - Apple Support
Perhaps this section of the iPad User Guide will help you with organising your Apps and App folders on your Home Screens:
Organize your apps in folders on iPad - Apple Support
The process works just the same in iPadOS16 as before in iPadOS15. If having reviewed the linked resources you continue to have difficulties, try a forced-restart of your iPad - as this will often clear an isolated software issue:
Force restart iPad (models with Face ID or with Touch ID in the top button)
If your iPad doesn’t have the Home button, do the following:
- Press and quickly release the volume button nearest to the top button.
- Press and quickly release the volume button farthest from the top button.
- Press and hold the top button.
- When the Apple logo appears, release the top button.
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Force restart iPad (models with the Home button)
Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
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If problems persist, please describe the problem in detail - if needed, providing screenshots where it may help to clarify the nature of the problem.