Yeahh! Like I said earlier on this topic ([MAJOR] Almost all hidden properties are now disallowed, they have been allowed since UEFN released until 34.30. - #34 by Sprintermax), the constrain aspect ratio is a very weird one and causes lots of bugs, in my opinion it should not only be exposed to let creators have flexibility on cinematics, but also having its default value inverted (from true to false), so creators without the “notepad trick” and/or with less experience with cinematics make things work properly on different monitors by default without needing to deal with settings that they maybe don’t even know about…