How would one go about increasing the font size of the on screen volume display? Additionally, how would one go about centering it? Bonus points if you can share how to alter all on screen font sizes, like the date and time.
Have you tried this?
It is generally central unless you changed it. Which Skin are you using?
You would have to edit the skin files themselves. This is all dependent on Kodi. You’ll prob find more relevant info here
Amber is the skin name. Checking settings now for the sizes.
Then I suggest you ask for help on their forum http://forum.kodi.tv/forumdisplay.php?fid=203