If you are set on using arch i highly recommend using archinstall or fedora and using the kde plasma or gnome desktop enviorment there are no files to configure and shit just works the desktop is also highly configurable. The only time youd be messing with cfg files would be if you are ricing your system to look like something out of r/unixporn which looks sweet but those people put ALOT of time and effort into it, and their desktop enviorments arent really meant for the average user.