Hi there. Ahhh I'm so sorry about that, the prototype wasn't made to support multiple monitor resolutions ☹️ the full game will have this functionality and extra resolution settings but for the prototype we just did not include stuff like that due to time constraints.
I will have a look in the next couple days and see if I can fix this to at least make it functional for ultrawide. I'll respond here to let you know once I've done it and if there's an updated build.