How do I get a restrictive passcode

If you're talking about the passcode to lock/unlock your screen, see these suggestions:--> Use a passcode with your iPhone, iPad, or iPod touch - Apple Support.

If you forgot that passcode:

On iPhone:--> If you forgot your iPhone passcode - Apple Support

On iPad:--> If you forgot the passcode on your iPad, or your iPad is disabled - Apple Support

If you're talking about the passcode to lock/unlock Screen Time:--> Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support

If you forgot the ScreenTime passcode, These are the minimum requirements to reset it:

• The device must run iOS/iPadOS 13.4 or later;

AND

• You must know the Apple ID & Password that were used to set up that ScreenTime Passcode.

If you meet both above requirements, these are the instructions:--> If you forgot your Screen Time passcode – Apple Support

Shouldn't be this case, you need to erase that device following these instructions (even if related to the passcode to lock/unlock device's screen):--> If you forgot the passcode on your iPhone, or your iPhone is disabled - Apple Support

The bad news is that you cannot restore data from a backup, since the ScreenTime passcode would come back in.

If you mean something different, please better specify your needs

Regards

Giulio

If you have forgotten the ScreenTime (a.k.a. Restrictions) passcode, one of the two procedures outlined within this link should resolve the problem:

If you forgot your Screen Time passcode - Apple Support

If your iPad is capable of supporting iPadOS 13.x, you should update to the most current version before attempting to resolve a forgotten ScreenTime passcode. The most recent iPadOS updates have introduced a new mechanism whereby a forgotten ScreenTime passcode can be reset without wiping the iPad.

To reset a forgotten ScreenTime passcode on older versions of iOS/iPadOS, the iPad must be reset “as new”, losing all locally stored data. In this situation, you’ll not be able to restore your data from an iCloud or iTunes backup - as the forgotten passcode is integral to the backup.