When i working on “Adjust track” accidently i touch some area and disappears “corner highlight” and i just can move the “yellow line” that annoying me 
What is the purpose of “Yellow lines”?
The yellow lines tell you that the angle is approaching something mocha does not think it a good reference point, red lines mean it’s a bad choice. Green lines between reference points mean that the plane is a good choice. Please let me know if you have any more questions and I will be happy to help you.
Cheers,
Mary
I think you talked about orange lines , am i right? but i am talking about completely yellow , which sticked to the reference points
Ah, ok, sorry. Yes, the solid yellow lines.
The solid yellow lines draw a line from your new reference point to the corner of the surface, they are meant to show you the offset and what your original reference points are doing. It’s just a visual aide.
Does that make more sense?
Cheers,
Mary
Yeah thank you!