> the "Manage" tab [...] from the information page
I agree that the "Information/Manage/Configuration" tabs in Gajim (npub1u4t…7ldx) are confusing.
"Information" lets you change the name of the MUC in your bookmarks (so the name only _you_ sees) while "Manage" lets you change the "public name" of the MUC. And then in config, you can also change that public name ("Title"). It makes sense when you know the protocol, but users shouldn't have to. It's probably relatively easy to change, code-wise…