Branding what your customers see — A brand for one workspace
An account that runs more than one business can give a workspace a brand of its own. On a help desk's status screen, Change beside Replies are signed opens that workspace's branding rather than the account default. Save there and everything that workspace publishes wears its own brand from then on; the default stops applying to it.
A workspace that has never saved one keeps following the default, and its page says so. The first save starts from the look the workspace was already wearing, logo included, so nothing disappears at the moment it stops inheriting.