Note the two icons to the right of the rule's title: and . If you click on once, the rule will be minimized to just its title, its description if it was showing, and the When section. If you click on it again, only the title and the rule description will be left showing. If you click to hide the comments, only the rule title appears.

You can then use to revert it back to either the title and condition, or the entire rule with title, condition and action. If necessary, click to display the rule's description.