Mirror display gone

[Robert Moskowitz]

Xfce 4.14 on Fedora 32.

I was running standalone with no external monitor for a few days (power 
outage, and could barely get enough electrons for my notebook!).

I now try to get mirror display with my external monitor and the option 
is greyed out.

I have mirrored display before log in, but once logged in, I do not have 
the option.

I have set my laptop resolution down to 1024x768 to be the same as the 
monitor, but all I get is side by side or one display or the other.

I have seen this in the past, and a reboot fixed it.  But not this time.

Suggestions on how to get mirror display working?

thanks!