"Geometric Constraints" message is displayed.

About "Geometric Constraints" message "This dialog is designed for special cases of geometric constraint creation". It allows you to create geometric constraints between multiple selected objects and a single other object. 

Solution

How it works:

Select Geometric Constraints

Get the message:

Use a part with simple lines placed randomly.

Select Object to constraint:
Select as shown

Select Object to constraint to:
Select the remaining line

Now select the constraint type:
Say Perpendicular:

Say Parallel:

Say Equal:

Notes and References

Hardware/Software Configuration

Platform: INTEL
OS: windows
OS Version: 10-1909
Product: NX
Application: DESIGN
Version: V12.0.2
Function: SKETCHER

Ref: 001-10069276