The scope switch is gone. It existed because "select a folder" was ambiguous
in a list that could not show folders, and turning that ambiguity into a
control just moved the problem onto the user.
The list now shows what a folder contains: its sub-folders as entries first,
then the documents directly inside it. So the mode follows what the user is
already doing instead of a switch - browsing shows one level, and any active
filter searches the whole subtree flat, with a breadcrumb note saying so. A
document uploaded on its own needs no special row either: it sits at the top
level next to the folders, exactly where it is.
Folders can also be adjusted now, which they could not before - a mis-filed
upload previously had to be deleted and re-uploaded. Documents move via the
row menu or the batch bar into an existing or newly typed folder, and a
folder can be renamed in place, carrying its subtree. Both are plain
folder_path updates: nothing is re-parsed, re-chunked or re-embedded.