Vertical (portrait) causes bad proportions

Hey!

I think there should be the option to choose a fit. Specially for vertical resolutions.

![screen2](https://user-images.githubusercontent.com/18117559/82149434-1a5b7700-9857-11ea-8580-5e6ea7db9521.jpg)