I submitted a ticket to Evernote Support regarding Big Sure compatibility. At those time Evernote is NOT officially compatible with Big Sur, which is important because if you upgrade to Big Sur and have problems, Evernote would not support you. I expect that once they finish testing and officially support BIg Sur, the following article will be updated to reflect that: https://help.evernote.com/hc/en-us/articles/115012107027-Operating-system-requirements-for-Evernote