With version 3.015 (taken from an acronis backup) the “Move Objective Tracker” and “Lock Objective Tracker” are selectable (not grayed out). But, with 3.015 I get a huge amount of errors and the game wants to disable the addon.
These are taken with a fresh copy of 3.021 and zero .lua errors
Can you also try with just Dugi Guides enabled.
You can then enable one addon at a time to try to pin point what addon triggers errors, if we can find the addon we can then look in to making it work.
All addons disabled worked, I then enabled Elvui and went back to grayed out for “Move Objective Tracker” and “Lock Objective Tracker” in the frames section and grayed out for “Anchored Small Frame” in the display section.
Seems like it is having conflicts with Elvui, though the older version 3.015 does not have this issue (well aside from generating errors).
Additionally I decided to try out the Dugi Questing Essential from Curseforge. Seems to not have any issues, although not getting the benefit of any of the guides with this. Just figured I’d let you know if it helps in tracking down what may be the cause for why 3.021 does not allow Objective Tracker to function.