My app are smaller or bigger

This is bug of which we have seen frequent reports in the Support Community. The problem has been largely ameliorated in iPadOS 14.0.1, but not entirely cured.

The issue of inconsistent scaling/sizing of Home Screen App/Folder icons also extends to the new-style Widgets - whilst the old style Widgets are seemingly unaffected by this bug.

As Apple engineering do not or review any posts to this site, please report the issue as a bug using this Apple iPad Feedback Page:

https://www.apple.com/feedback/ipad.htm

When submitting the report, ensure that you include details of your iPad model and installed version of iPadOS in the body of the report. The drop-down menu doesn’t yet include iPadOS 13.7 or 14.0.

Please do not rely upon others submitting this issue to Apple. History demonstrates that only those bugs for which sufficient reports are received will be assigned priority for remediation.

A forced-restart of your iPad may be helpful:

• On an iPad with a Home button: Press and hold the top button and the Home button at the same time. When the Apple logo appears, release both buttons.
• On an iPad with Face ID: Press and quickly release the volume up button, press and quickly release the volume down button, then press and hold the top button. When the Apple logo appears, release the button.

I hope this information and guidance proves to be helpful in resolving the issue.