You cannot build an iPad app in Xcode 14 and run it on an iPad with iPadOS15.7 (16 isn’t out until October)
However this IS a “patch” I found, and it seems to work
first SHUT DOWN any instances of XCODE
In TERMINAL MODE
cd /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport
sudo ln -s 15.5 15.7
Reboot the computer (maybe overkill, but it won’t hurt)
Execute Xcode 14
Attempt to run any Xcode project on a REAL iPad with 15.7
Note : it may take a while to pair with the Ipad, but once it has, you are good to go