Sometimes entire arc segments are selected with a single click, and extrude with hidden segment lines. Other times, only individual segments can be selected and lines are visible when extruded. What causes this to happen?
The arc tool offers bright green/blue inference that indicates tangent to connecting line segments. Sometimes, the tangent indicator is triggered simply by beginning to draw an arc, other times I have to search for the snap, and sometimes it never shows.
How can I get consistency with the arc tool?