Hi! For my very simple project I just want to look through the cine camera I created. What I did was create a pawn bp class, add my cine camera to it and then create a game mode where the default pawn is set to the one I just created.
Now when I adjust for example the aspect ratio of the cine camera and press play, I get a different view once in play mode. See the screenshot. I pinned the view through my cine camera that is placed in the level to show the difference.