You could use Safari Web Inspector on iOS 14.7 beta 2. But it didn’t work on iOS 15.0 developer beta yet.. https://github.com/WebKit/WebKit/commit/db0740fe4f4d8ec1ccd673582a61bb55605c268e#commitcomment-51848383

It works after iOS 15.0 developer beta 5 with Safari Technology Preview. :) and also you can use inspector on Simulator on Xcode 13.0 beta latest version

I decided it would be more appropriate to provide an explanation than to send in a sample project. I used addSubview some views inherited UICollectionViewCell to a view that was not UICollectionView. UICollectionViewCell was used as the parent view in order to use views of various structures while maintaining SSOT in UIStackView (or autolayout) and UICollectionView. As a result, changes calling invalidateIntrinsicContentSize() in UICollectionViewCell in iOS 16 affected my structures

As you said, I just posted it on feedback assistant. Thanks