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I have the latest updates for my MacBook pro and Ipad Air (3rd Gen). When I use my iPad for sidecar it shows a different aspect ratio than it used to. When in sidecar mode, the iPad has the top 1 inch and the bottom 2 inches cut off / unusable. I do not remember changing any settings before this suddenly happened one day. Any help would be appreciated.
iPad Air 3
Hi Macisback100,
Thank you for participating in the Apple Support Communities. We understand that your iPad will not show a full screen resolution when using Sidecar. We recommend making sure everything is set up correct by following the steps in this article: Use iPad as a second display for your Mac.
"Sidecar requires macOS 10.15 or later and iPadOS 13 or later on supported models.
Set up Sidecar
3. On your Mac, do one of the following:
> System Settings, click Displays 
, click 
, then select your iPad from the list below “Mirror or extend to.” > System Preferences, click Displays 
, click Add Display, then select your iPad from the list below “Mirror or extend to.”"If the issue persists, Contact Apple Support for further assistance.
Take care.
Sidecar not showing full screen on Ipad
