In the English language, those of us who use it know that the sentence structure as written;
Program design fails to conform to system settings. It does not fit screen display size.
is not meant to be broken up. That is why it is in one paragraph. By so doing you have misinterpreted the meaning. Please note that the first sentence is designed to make a general statement, and the second one is designed to give specifics. As such, it is completely accurate and correct, as well as being self-explanatory.
You also failed to look at the screenshot in detail. Discerning viewers would clearly notice that the right side of the program is beyond the border of the screen. No program should ever be that way.
As to your opinion about screen size, it is meaningless and has no bearing upon the issue of the programming flaw. If you knew anything about current computer programming you would have noticed the obvious problem.
Further, the vast majority of programs running in the Xfce DE have no similar problem. It is only the few who have bad programming that cause any issue such as with the standard button usage design. That is why it is a standard which all programmers are supposed to follow.
Finally, while I understand that some programs are distributed by Snaps, Flatpacks, Appimages, etc., the standard has been and will always be to distribute a program in rpm, deb and similar install formats so that the user has consistent application of any program installation for their specific distro. So where is the .deb file?