User blog comment:MisterWoodhouse/The first migrations to the Unified Community Platform/@comment-99.30.124.73-20201030181337/@comment-1038387-20201031003345

Legacy is updated. It was Forked MediaWiki 1.19, and now it's MediaWiki 1.33. The main changes for UCP are for the elements from Legacy that were forked.

Source Mode has syntax highlighting. You can turn that off in your prefs; you can also set fonts. It does look a bit more cramped though.