[Pretamanteau]

Simple test drew a compass circle then...

1) Hovering over it with just mouse, no response
2) Hovering over origin or end point with compass tool selected, highlights red
3) Hovering over with eraser, nothing until over origin point (which allows deletion)

From (2) above, clicking on end point keeps circle red but doesn't allow resize, clicking on origin point keeps circle red but doesn't allow movement

From (2) above, a single further click deselects the artifact, whilst a click&drag draws a new artifact