Same happened to me it is a update glitch.
When I updated from 10052 to 10080 i also did not have "extra" in settings.
After I did a hard reset still no "extra" in settings but in the app list I saw the "extra settings" in my app list but after a store update glance, touch and one more got updated and disappeared also out the app list.
Then I used the WPRT to roll back.
I ended up with Cyan (but my CV was already on Denim).
I updated OTA to Denim.
Installed the Windows Insider on fast ring.
I first got Update 2
After that I got W10 preview with "extra" in the settings.
So it took a while but in the end it worked.