Cloth Component: Missing Particles, Unity 2018.3

On the tutorials for cloth, when you go into edit constraint mode the mesh displays a wireframe along with coloured or black points indicating where the constraint vertices or "particles" are, but in my Unity editor these points are invisible. The wireframe is there, and you can select the points and edit them, but they are just not visible at all so I have to guess where they are. I'm sure this is just som UI display option, but I can't seem to find it