By default, rules do not categorize the items that the rule conditions match if they have already been marked or tagged manually in the Review pane. You can use the override manual categorization feature to change this behavior and allow the rule engine to categorize all items that match the conditions.
To override manual categorization
In the Cases pane at the left, select the case for which you want to override manual categorization.
Click Override Manual Categorization near the top of the tab.
This feature remains in operation until the rule engine has completed its run based on all the current rules. When it has completed its processing, the override manual categorization feature is automatically turned off again.