Setting screen size for single screen local multiplayer

Hey
I’m messing with Paper2d, and got my orthographic camera to set 256 width. What is the best way of setting it so when the game run’s (regardless of screen size) it’s always the size I want?
For example, playing in Editor Vs Standalone Game are very different.
I wasn’t sure if this was something I should be setting in my GameMode blueprint?

I’m doing something similar to what you want to achieve, have a look at my implementation of the camera: