Dorico Write Mode Entering & Using Attribute (not Direction)

I think. I’m set up properly with my expression maps to try using Attributes for Playback in my scores. I have Playback Techniques set to Attribute and Playing Techniques-> Continuation set to Line but cannot get any of the line options to do anything. I want so see where an articulation starts and where it ends so I can change to another articulation. I’m seeing the same as using Direction–no line, no end point of the articulation. I had thought that (on Mac) pressing Opt+Cmd on the highlighted articulation would make the line appear with the right arrow extending the line. What am I missing?

Try extending the duration of the playing technique with *Shift+Alt+right arrow.

That was it! I had the wrong key combo. Shift-Alt-Right Arrow.
DOH!
Thanks Daniel!