@amandataintor , once a user dismisses a global announcement by clicking the X, it's well and truly gone, and cannot be brought back. In fact, this is almost the very first thing I show new teachers in training sessions. I have a dashboard mocked up with a global announcement appearing on it, and tell them not to click the X until they're sure they've noted all the information they need from it.
By the way, the idea of hiding the announcement rather than "deleting" it has been floated as a feature idea a few times, but never gained much traction.
