9/17/20 just finally was able to download Big Sur this morning and immediately went to use side car for work like usual but the mirroring options are different/gone don't see my ipad pro listed like normal.
bummer.
I have the same issue you described.
macbook air
ipad pro 11
on os 14 on the pad and big sur on the macbook air
but....
did find it under Sys. Pref.>sidecar
ctumbaga579
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