config_pro

Are you asking a question?

To change the background color, go to file - options, system appearance, adjust the colors to your liking then "export" the system color file, typically syscol.scl.

Then go to the configuration editor and add the option system_colors_file and "browse" to find your syscol.scl file. Save the config options to your config.pro.

File name length is a system thing, you can't adjust it.