Before you upgrade, please read this:
Thank you for your answer.
So if I read correctly, Dreamweaver is not yet compatible with MAC Big Sur. It is not in the APP list...
No, that is not correct. DW 2021 is compatible with Big Sur but Big Sur still has some known issues. You may prefer to avoid the issues by waiting a few more weeks to upgrade. The choice is yours to make.
Thank you, for your clearer answer. I will wait a little longer before going to BigSur