I will give an example...
Say I have downloaded a pdf, which appears in Download folder (or a subfolder of it).
I want to move (or click and drag) the pdf to a sub-folder within Pictures folder.
On my old PC, I would first go to This PC, Pictures then open Pictures, and specify open which sub folder I would to move to.
Then I would go up to Quick Access, Download folder, then drag the PDF file down to This PC, straight into waiting folder. Easy!
This has always worked in Win 10, and in older versions of Win 11.
But with new PC with latest Win 11:
-The Quick Access folders (eg Pictures) are there, and I can open sub-folders too. Good. Note I can't have 2 sub-folders open concurrently in Quick Access eg if I have Downloads folder open, and I then go to Documents, it will close Downloads sub-folders.. so both can't be open... so I need somewhere else ie This PC.
-The folders (eg Pictures) are no longer in This PC, so I can't open and prepare the target folder.
If I can't explain this to you, I'm sorry, and I will settle for the semi-ok solution.
ie 3 dots, then Options, View, Navigation Pane, then tick on "Expand to open folder".