That's the initial application tab. It is used to open databases and 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 database being compared. Each part shows path of the loaded database and allows the following actions:
Note that Pragmas are marked with 'DIFF ONLY' because they are only compared and can't be synchronized. Tables are marked with 'MERGE NEW ONLY' because application currently does not support changes syncronization for existing tables (like import just one new column for existing table). You can import only new table definition. For existing tables you can drop target table and then import source table as new, however in this case 1) you'll loose data in the target table, and 2) drop action may fail because of other objects depending on that table.
At the bottom there is a collapsible Recent databases section showing last file 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: 2022-02-17