I am attempting to add a shape marker to a line in ArcPro. The options in the symbology properties are "On control point", "On extremities", or "On regular vertices" (see attached image).
How does one either add a control point, or turn a vertices into a control point? There is zero documentation anywhere.
If helpful to know, the symbology has been converted from representations in ArcPro.
(In case anyone asks, this has nothing to do with control points used for georeferencing.)
