@Sajith Is that screenshot of a black screen? Also is it from Canvas App or from something else?
In any case it depends what you are doing on that screen. I think more detail is probably needed. What are the formulas used over there like OnVisible of that Screen, perhaps OnSelect of the button that gets to that screen, etc.?
Probably there is a formula with too heavy processing over there which need to be rewritten or concerns something that should not be processed in this App. (some of them may be good candidates to move to Power Automate Flow, for instance).
As for having lots of Controls - go ahead try and Save a copy of the app (File Sav As). In this Copy try and take out the Controls one by one. If even with the simplest control you have the same black screen, the problem is not with any Control but with a formula somewhere else like OnVisible of that screen, etc. You can try and check on this as well.
Without knowing any other detail besides this screen shot of a black screen though, I might have trouble to really give any advice other than the generic advice above.
