Solution 1:
Next to "Favorites", if you hover over it, you should see an arrow you can click to expand the section. It must've been inadvertently clicked, since it's not new to Big Sur.
Folders missing in sidebar with Big Sur
Solution 1:
Next to "Favorites", if you hover over it, you should see an arrow you can click to expand the section. It must've been inadvertently clicked, since it's not new to Big Sur.