The cinematic mode is a wonderfull function to use when you play matinee or something and you need the player to be unable to use WASD to move or you need to hide the player…u]you only can call this fuction in Level Blueprint. To active it you need to check the cinematic Mode box and choose what you want to do with the player…
Hide player
Hide Hud
Unable Moviment
Unable Rotation
After you cinematic or event…to deactivate the cinematic mode…only copy the previous cinematic mode and uncheck the Cinematic Mode…when you do it the UE4 will see you want to disable the function and will see your check box what you want to restore