Extract many .zip files to destination in unattended queue?

I am trying to use "Extract to Destination" on thousands of .zip files from a flat view into a single folder (don't recreate source folder structure). I want it to be unattended and always use replace and merge, without asking me every time.

Neither the unattended checkbox works for this, and
COPY QUEUE=MyQueue EXTRACT
instead of
COPY EXTRACT
also doesn't work. It seems every single selected .zip file is treated as a new extract operation.

Is there a way to do this?

EDIT: I found a way by using
COPY WHENEXISTS=replace,merge EXTRACT
It would be nice to set this in an interactive way, but it works.

Have you tried the dropdown?

Yes, I tried the dropdown as well as the unattended dialog. The problem was that the Confirm File Replace dialog kept re-appearing for every new .zip that is being extracted.

I see. It didn't in my tests. How are your preferences set?