You may temporarily pause a search in progress by clicking the "Pause" button on the Main ribbon. The "Pause" button is in the same place as the "Start" button and is automatically changed from "Start" to "Pause" when a search begins. Once you click "Pause", it will be automatically changed into a "Resume" button.
To resume your search, click the "Resume" button, which is in the same place as the "Pause" and "Start" buttons on the Main ribbon.
Pausing a search is beneficial if you need to interact with a certain result and you find incoming results distracting. It is also helpful if you need to temporarily pause Identity Finder because it is affecting the performance of your computer. In this case however, it might be more helpful to allow other programs to take priority over Identity Finder by enabling the Give Other Programs Priority Over Identity Finder option.