@a-ovbord I am sorry, but this issue isn't solved. The reply marked as a solution doesn't solve my problem.
I made brand new app, turned off "Scale to fit" option, set Screen width to Min(App.Width, App.DesignWidth) and made sure "Optimize embedding appearance" is turned off. As a result, whole app moved to the left side of the screen. So it's definitely Scale to fit, what causing this.
Or is the topic marked as solved because there isn't any workaround?
Many thanks for any help,
Patrik