Bug Report
The Constraints Panel is missing the tools past the “Parent across Comps…” mentioned in the DUIK help about the Constraints Panel. Please see screenshot. Also I don’t find the new Separate Dimensions Tool
The UI has been (re)set to the "Rookie" mode which hides the most advanced tools, you'll have to go in the settings and set it back to "Normal" or "Expert" ;)
Environement
After Effects
OS
What's the issue?