BigSur upgrade breaks the share menu option in Safari I've just upgraded to Mac OS X Big Sur (Version 11.01) from Catalina. Normally in the browser or finder you can select the 'Share' to send information to another application. For example, if browsing a site and want to save the information I would typically select the 'Share to' icon, select Notes and then my information would be saved.
After upgrading to Big Sur I've hit the following issues:

Share menu in Safari is empty
Selecting the 'More' option pops up
the Extensions preference which is all blank


Now if I try the path of going to the Safari option to add an extension the new functionality in BigSur pops open the App Store. I can select an option and after installing it then says to return to the Extensions 'management' screen but nothing is able to be selected or activated.
Net result - stuck !
Does anyone have any suggestions
I can suggest you to reinstall macOS BigSur from the recovery but without deleting your drive (so you don't loose your stuff)
The good thing is that inside of macOS the System and user partition is separated so you are not forced to touch the user partition while reinstalling the system!