The gitlab frontpage (lab.civicrm.org) should always default to /explore/groups
Following a discussion on mattermost, @andrewhunt suggested Gitlab would be more intuitive if the front page always displayed https://lab.civicrm.org/explore/groups (instead of "your projects").
When a user is not authenticated, they see /explore/groups as well.
I will check if there is a global setting, and if not, add a rewrite in Nginx.
Edited by bgm