So something like;
therube
(Directory names are found.)
therube
!.
ext:
regex:^[^.]*$
!.
Checking now in a new instance, doing the same there is nothing by default when I go to Organize.I had a sneaky feeling...
Not being familiar with "omit"
but seem to recall dealing with "temporary excludes" - ages ago (but then no more)
And it seems I must have had that "temporary exclude" left over from times past
So when looking to see what "omit" does, I clicked, Index -> Enable Omit Results, which changed my results.
And when I went to Organize Result Omissions, I saw the above mentioned filter - pre-existing.