I don't know if this is a bug or my fault.
So, I was almost done with my animation and wanted to test it. I pressed test movie but then in the player, the images were hugely out of scale. I mean, almost all of the video was visible only in the upper left first corner.
Strangely, this wasn't a problem when I used the play button to see the animation.
I tried to lock the scale to 1920*1080 or click match contents but this made it even worse.
Any ideas? Thanks.
Maximize the player or use your mouse at the window border to scale the player so that it fits. After adjusting it, don't close it down or the player size will reset, minimize it instead.
Alright, it worked. Use this and change the camera position and zoom a little and it's fixed.