This window can be accessed via "Help" menu in the title bar.
This menu's data is synced with the in-app-list LDN game data, and that has been modified to hide unjoinable games (in-progress and/or private (needing a passphrase)). You can still see these games in the list.
Moved AppLibrary, Configuration, and PlayReport namespaces to Ryujinx.Systems, add the compat list stuff in the base Ryujinx.Systems namespace.
Moved the compatibility UI stuff to the proper UI view/viewmodel folders.