Problem with storyboard constraints

I don't understand why my view don't responde correctly with inserted constraints. I show you both constraints and final view.

Constraints:

View:

Can someone help me? I just want a centered scroll view!!!

I understand it is UIKit, not SwiftUI.

You need to define more constraints for a ScrollView. And notably the constraints for the contentView.

I wrote a short instruction page, if that may help as an example for a vertical scrollView that contains a certain number of items.

Don't hesitate to ask for more explanation.

solved. thanks!!!!

Problem with storyboard constraints
 
 
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