This forum is the CI build from master right out of the repo, so what you see is after the current release. The biggest change is the in-progress migration to Bootstrap 4, among other things, so it looks really different.
If you want to see a sort-of real life instance of v14.1, check out CoasterBuzz. There are some typography and color overrides (still using "naked" Bootstrap 3.x though), and some moved user nav, but otherwise it's the same. There's a branch for v14.1, for your convenience.