I took a look at few apps which use Sign in with Apple and noticed when user makes sign in for the first time, they show the "view" with name and email (share/hide):
And after I Sign in with Apple and delete the app and install it again from App Store, it will show a "reduced" view with just a continue button:
I have been following this tutorial https://www.raywenderlich.com/4875322-sign-in-with-apple-using-swiftui and what I get after unistalling the app and installing again is the "big" view with name and email. Any idea how to show the "reduced" view if user already signed in the past ?
(after problem resolved in comments below)
The simulator does not always work properly - use actual (physical) device running iOS 13 or later.
Sorry for asking in answer - don't have enough reputation to comment on your question.
Is your sign-in (via Sign in with Apple) into app successful (can you read a name and email of the user)? If not, you should investigate why is the sign-in process failing and fix it.
It's a choise of operating system (OS) which view will appear ("big" or "reduced"). You cannot force OS to show the one you want ("big" or "reduced").
Your observation of apps from AppStore is correct - the "big" view will appear only at first sign-in into Your App. Next sign-in in same App will be done via "reduced" view, unless you revoke the access to AppleID for that App (on your device go to Settings -> Your Apple ID Name -> Password & Security -> Apps using Apple ID -> Your App name -> Stop using Apple ID).
So the behaviour - you're seeing again and again (after reinstalling app) a "big" view is indeed unexpected.
As first step I would recommend you to look into (your device's) Settings for the list of Apps using your Apple ID (see path into Settings above):
If your App is not listed there at stage 1) than the sign-in is most likely not successful and you should investigate it.
If your App is listed there at all stages (1 - 3) I would just revoke the permission&restart, delete an app and restart the device.