Sculpting Viewport Shading Please forgive such a basic question but I'm very confused - my viewport shading in Sculpt mode is gray, instead of that nice red colour. I'm sure it always used to default to the red. I've restored the factory defaults, I've reset the preferences to factory defaults and I deleted the startup file under User/AppData/Roaming...etc. Nothing has worked. How can I restore the default behaviour, or have I overlooked something silly?

I'm using version 2.82
You probably just have your viewport shading set to something else. It varies by each individual 3D View window as well.

Click on the little icon as indicated. You will find the red material you're looking for in the matcaps section.