I would like to add vertical drop lines to a few different graphs, but I only want drop lines to appear when a single point is selected. When a user selects multiple points, I would like the drop lines to not appear for any of the points. Is this possible to do? Here are pictures describing the current state that I am referring to:
A single drop line appears when a single point is selected, as desired.
When multiple points are selected, I would like no vertical lines to appear.