Cannot pick default repository location in GUI

according to https://docs.gitlab.com/ee/administration/repository_storages.html, I can define multiple places to put repositories, and use the GUI to select which one is used for new projects:

Choose where new project repositories will be stored
Once you set the multiple storage paths, you can choose where new projects will be stored via the Application Settings in the Admin area.

I can get the multiple repositories, but all new projects end up in whichever was labelled “default” in the git_data_dirs setting in gitlab.rb, and I’ll be darned if I can find the “Repository Storage” pulldown (actually, can’t even find Application Settings in the Admin Area)

I’m running omnibus 8.11.6 410d751 on a dedicated Ubuntu 16.04 VM.

Am I missing something, or are the docs incorrect?