This extension says that it is being used on one or more Wikimedia projects. I couldn't find one on which it looks like it is really used. Could you provide me with some sites so that I can have a look how things work?
Topic on Extension talk:DynamicSidebar
Per https://noc.wikimedia.org/conf/highlight.php?file=InitialiseSettings.php, it's only used on Wikitech (and test Wikitech).
So for those who come later, here's an actual link to that project group-sidebar config. https://wikitech.wikimedia.org/wiki/MediaWiki:Sidebar/Group:cloudadmin
Looks like it needs the group as expressed in Local Settings, so "sysop", not "Administrator" or "Administrators".