Did you try messing with the UI scale setting?
Viewing post in Roody:2d Demo jam comments
Okay yeah I have now, I didn't notice that before. that helped a bit, but it is still an issue. Maybe a separate option like "overscan" or something some games call it. Basically it allows you to increase/decrease the margin or padding around the edge of the screen that all in game UI elements like the on hover selection tooltip, the the health bar and quick item slots, and and the chat messages on the bottom left would use where it pushes them in to the center of the screen or allows them to go out towards the edges, either for playing on TV that crop into the picture a bit, playing fullscreen on a macbook with that stupid webcam screen cutout they do now, or in my case when the window is slightly wider than the screen res.