It would be good if you could hide archived projects when viewing subprojects (i.e. this kind of page https://phabricator.wikimedia.org/project/subprojects/2480/). If you have yearly projects (like we at WMSE do) the list soon contains a majority of archived projects, which usually aren't that interesting.
A solution could be to either split the list into active and archived projects or to hide archived projects by default and have a button for showing them.
The simplest solution that already exists is that phab supports nesting subprojects, so you could have WMSE → 2020 → Wikipedia-in-Education-2020.
The ability to hide projects on the subproject view is something that should be raised upstream.
Maybe showing first active subprojects, and then archived subprojects? Hiding might be more confusing?
Hiding something requires to make the user realize plus UI to unhide.
@Aklapper: I like the idea of simply sorting the active ones first. I'll see if that is difficult to implement.
While this would work for most project, we have some that are still ongoing from earlier years.
That could work too.
How is this implemented (link?), and would this be something to propose to upstream Phabricator developers?