Navigate to “Settings” > “Style Configurator” and modify the font size for the desired elements

The “desired elements” are dialog box font, which are not controlled by the Style Configurator (or any other location in the Notepad++ settings), so your advice will not help.

Besides it kept crashing and restarting over and over, so I had to revert to the older version. Curently using 8.4.2

This is unrelated to font-size issues.
It sounds like a problem with a plugin. You might want to have a look HERE.

See my 3 years old comment in this thread:
https://community.notepad-plus-plus.org/post/51597

Modern applications need to work properly on screens with different DPI (size and resolution).
The first applications that had to deal with this problem are internet browsers which needed to scale the same web pages to multiple resolutions.
So modern applications (e.g. vscode) borrowed the technology from browsers.
The advantage: they scale reasonably well on multiple screens.
The disadvantage: UI performance of local apps on your own computer that used to be blazingly fast became as slow as a web browser.

Notepad++ is not a modern app and will likely never be converted to modern UI technologies.
Therefore its UI is still as fast as apps of 15 years ago. But its scaling is problematic.

Don’t know what changed in the last version. The usual scenario is:
User X complained. User’s X problem was fixed. The fix broke things for user Y(ou).

You may be able to brute force compatibility features to make it look well on a specific screen but if you are using a laptop that has its own resolution and also docked into multiple other screens you are out of luck.

Luckily all of us old-timers that remember that computers used to be fast will be gone soon.