Logitech C920 - Follow my face support for OSX 10.14
I'm surprised their own suite even recognises it - it didn't when the C920 was new…

From Logitech's C920 page


  Compatible with:
  Windows® 10 or later, Windows 8, Windows 7
  
  Works in USB Video Device Class (UVC) mode with supported video-calling clients:
  macOS 10.10 or later
  Chrome OS™
  Android™ v 5.0 or above
  USB port
  Internet connection


So for anything other than Windows, there's no specific support, only as a generic 'UVC' device.
Many Mac users have complained about this over many years… as I got mine in 2012, I doubt it's anything they're going to be adding any time soon.

You can get a lot better than Logitech's basic support with a 3rd party app called Webcam Setting [$7.99] &amp; though it can't do 'follow my face' it does make the camera considerably more useful. It also hasn't been updated in 5 years, but then neither has the camera.
It works well up to Mojave. I can't test on Catalina, but at least it doesn't get the "May not work in future OSes" warning at launch.