Has anyone managed to get the font sizes to go above “large” with editing of the xml file? I play at an extremely high resolution and one unfortunate side effect is the chat is very tiny and hard to read. Even on large setting.
Unfortunately, we don’t have a fix for text sizes when playing on a resolution higher than 1080p. We don’t support resolutions greater than that, and unfortunately cannot provide fixes for the resulting small text size. We apologize for the inconvenience this may cause you.
there is a way to do it by customizing the fonts.xml file.
the next problem will be that the text may end too big for the UI graphics 
And I am not aware that chat exist in this community.
Yes, if OP changes the original file, it is deleted. If it makes and pastes a skin as the only file, it will replace the Steam file. that’s exactly how skins should work, so OP should be good. OP can pick up an existing skin to understand how the directory tree is configured and where the file should be. if this method does not work then try fontvilla