Share menu (Safari) options gone after Catalina 10.15.6 update

That's a problem. I have never seen a completely blank Share Menu options panel.

What is the history here. Has this always been the case since you bought this Mac, or these items existed in 10.15.5, and then simply vanished in 10.15.6? Are you using any so-called Mac cleaning software, or anti-virus products that may have flagged these files in the past to remove?

I suggest that you download the macOS Catalina 10.15.6 Combo Update and install it. This will simply replace any missing or outdated items in the operating system, and leave your personal data alone. However, always a good idea to perform a Time Machine backup before any System update/upgrade.

Aside from the fact that Apple moved the Share tool to the right-side of Safari 13.1.2, it is inactive until a webpage is viewed. I have Catalina 10.15.6 and all of the Share tool menu items are present.

Quit Safari. Visit System Preferences : Extensions : Share Menu, and see which missing items are unselected that you can reselect. Restart Safari, and with a web page open, reassess if the Share tool's menu items have returned.

Good. Unless you have installed a FaceBook client that also provides a FaceBook Sharing extension, I believe Apple removed these several operating system releases ago. If you do have a FaceBook application, reinstall it to see if it restores the FaceBook Sharing component in Extensions.