After having imported ne pictures in Lightroom Classic CC, they are in the section "previous" import. This should be treated as a collection fom my point of view, since it would make jumong between collections and the current import a lot easier. Thanks!
Just put them in your own "Previous Import named or any name" collection using the Add to Collection during import. Then they will be in the collection panel. Also, why do you have to jump back and forth?
The easiest way to quickly navigate between Collections and, or Folders and define the few Collections or Folders concerned as Favorites and then navigate between them or them through the favorite menu that opens directly above the film thumbnails.