GitLab 8.9 is the next milestone.
They’ve already made some changes to the secondary navigation, and 8.9 will bring more, specifically on the project and group pages.
This also brings changes to the mobile version, though I just realized I’ve never really used GitLab on a mobile device.
Discussion for the new layout was discussed at Improve UX of left sidebar (navigation) (#14838) · Issues · GitLab.org / GitLab FOSS · GitLab