[Dx4win] QSL "Worked" not Mailed, Single Band

[ARS NZ3O (Byron) FM29fx]

I am trying to play "catch-up" on some direct QSLing for
those stations that are not yet on LOTW.

One of the DXCC Summary reports shows 17 countries
Worked but not Mailed on 10 meter CW, but it appears
the only way to locate them is to search for all 10CW QSOs.

Any suggestions on how to search or report to find these
easily?  I'm not sure why I can't select 10m and CW on
the Needed Listing, but that seems like the logical answer.

73, Byron