Hey Stormrage256,
While you’re in blueprints, you should be able to use the function “get viewport size” and it’ll receive the size of the monitor. I found a few different links that may help you a bit further:
[AnswerHub Post: Get Screen Resolution][1]
[AnswerHub Post: BP Screen Resolution][2]
Hope this helps!
Get screen resolution in blueprint or material - Rendering - Epic Developer Community Forums
[2]: How to set screen resolution with Blueprint? - Blueprint - Epic Developer Community Forums