When an App is in the App Store, you can see the info in the App Store with a web browser:
Appstoreconnect -> your App name -> App info -> Additional information -> Show in App Store.
in my case it shows
Compatibility
iPhone
Requires iOS 11.0 or later.
iPad
Requires iPadOS 11.0 or later.
iPod touch
Requires iOS 11.0 or later.
In my Xcode project settings, I have
Deployment Target ->
iOS Deployment Target 13.0.
What do I have to do that the minimum iOS requirements in the App Store respects my iOS deployment target in Xcode?