Show more only horizontaly in viewport

Hi, after a long time

I am releasing a little game which has UI attached to the upper and lower midde part of the screen. Is there an option to display more only horizontaly, so that UI will be displayed in right position?
I know that it can be done in Python but I feel very lazy today and I would like to know, if it can be done right in blender without coding…

Im a bit afraid of monitors with 4:3 aspect ratio.

If i understand you right you want to get black bars at upper und lower part of the screen?
Or do you want to render in a window with other aspect ratio?

Eh, I will try to make it more understandable so: Sthere is an option in Properties -> Render -> Display -> Extend that shows more horizontaly or verticaly. And I want to wiew more or less only horizontaly.