I started to ask "What's this not-a-panel panel in Unity, and how do I control it?" but I've at least gotten as far as realizing it is the "global menu".
My global menu has a message notifier widget in place that scans my email, empathy, pidgin, etc. for new messages. I'd like to …
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Remove Evolution from the menu (It shows me both Evolution and Thunderbird even though I don't have any email addresses set up on Evolution).
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Tell it to use Pidgin or Empathy — for some reason it is currently showing me both.
I'm frustrated that right-click doesn't give me any additional options here. I can't even figure out how to quit Pidgin, since it is only in my message indicator, not in my launcher.
Best Answer
The indicator menu items are in
/usr/share/indicators/messages/applications
so if you want to get rid of something, you can delete it from there. For example, delete
/usr/share/indicators/messages/applications/evolution
to get rid of evolution. Note that this will affect all user accounts, and it will be difficult to get it back.
For a less permanent method, create the folder
mkdir ~/.config/indicators/messages/applications-blacklist/ -p
and copy the menu items you don't want into there
This will only show up for your user. Of course, you can remove items from the blacklist folder to get them back.