I started a project in an older version of blender, probably 2.8, that I am just now getting back to with 3.4.
All the objects I created in the older version plus any new objects I add end up in an “Objects” collection in the outliner. I can’t drag objects to the other collections I created in the ouliner, those remain empty. This problem is only in the outliner. I can click an object in the 3D view and see it is listed in the sidebar as being associated with the proper collection. I can use M to move objects between collections in the sidebar. But the outliner window won’t reflect those changes. See the attached screen grab to see the problem.
SOLVED: Once I deleted the View Layer and that World thingy all the objects snapped into their proper collections.
Score 1 for me. You can’t beat me, Blender!