Hi. You can set up constraints related to safeArea. Safe area will be calculated at the top till the navigation item. Also you can hide top bar on any separated viewController as you want and create custom top bar.

Thx for your attention. The problem was with the launch screen in the Project setting. When opening in Xcode 12 for some unknown reason Launch screen field was empty. And scene bound has been set up as 320 x 480. As soon I set the correct launch screen - the problem was solved