In the search pane, you can perform several tasks. Click on the search box and it will give you several suggestions of common search queries:
If you start typing the word add in the search box, it will provide you with the most common queries containing the add word, as you can see in the following screenshot:
If you try searching for a user using the term test (and assuming you have users that contain this word in your directory), it will perform a search as you type and immediately ...