It’s gone. 
The window was too complicated for something as simple as choosing a condition/action, so I removed this tab to get a cleaner look. Even if the tab was a good idea, I don’t think it was properly implemented/designed to be really useful.
But it was. Saved me much time. How about this: Add an option “Show By Object tab when adding new actions/conditions” in GD preferences, off by default so people who want to use it can turn it back on.