Me too. Upgraded to Big Sur 11.0.1 and Evernote 10.3.7 and lost the ability to edit files using preview. Ugh. This is incredibly painful. Please tell me this was a mistake that just needs to be fixed versus some intentional attempt to force us to use a different PDF editor.
Interestingly enough, I can edit Excel and PPT files from Evernote without having to go through the Save As / New Note dance.