It's in the title, but just to unpack it a bit...
When configuring Hotkeys, there are 3 options which mention shadows:
Toggle Shadows
Projection Shadow
Skill Projection Shadow
Am I to understand that "Toggle Shadows" turns all types of shadow on and off, or does it just affect regular Skill Shadows (with Projection Shadows and Skill Projection Shadows being still available as "hold" keys)?
Also, what is the difference between a Skill Shadow, a Projection Shadow, and a Skill Projection Shadow?