The enhanced profile view in Salesforce (officially called the Enhanced Profile User Interface) changes how a profile’s settings are shown in Setup. Instead of one very long page with every permission listed, you get a short overview page, a search box to find any setting, and separate pages for each group of permissions.
In this tutorial, I will show you what changes when you turn it on, how to enable it, how to use the Find Settings search, and how to switch back. I tested every step in a Salesforce Developer Edition org, and the screenshots below are from that org.