That's the initial application tab. It is used to open databases and to get a summary about all database objects. Note that it does not provide information about data/content changes, only about object definitions.
Tab is splinted in two parts, each of them represents a database being compared. Each part shows name and server name of the loaded database and allows the following actions:
At the bottom there is a 'Recent databases' collapsible section. It shows last database pairs that were opened. Note that if you're running multiple application instances in parallel then one application can overwrite recent files data saved by another application instance. Maximum number of recent pairs is 10 for Pro and 3 for Free. Each file pair has the following actions:
Free version limitations:
Last updated: 2023-10-11