Fixed / Responsive UI? (Looks good on all size monitors?)

I have an ultrawide monitor. I can’t say it was the best investment but I can’t say it was the worst. I’ve noticed that a lot of scripts that draw text or rectangles don’t look well on my monitor. The photo below shows what I am talking about. I’ve noticed though when I rarely play GTA Online the UI is always within the 1920 x 1080 margins, I guess you could call them that. I was wondering if there is a native I am missing or something like that. So it looks good on all monitor sizes. Please let me know any help would be appreciated!