Tools & Properties background Alpha: How to you make it invisible while sculpting

Dear Blender Jedi’s,
Where can you change the background alpha of the Tools and Properties? I’ve dug around in the user settings (but with no luck). I’m wanting to be able to see more of my sculpt through those two tabs while sculpting in the main 3d workspace.

User Preferences / Themes
Under 3D View change the colour of the Region Background value


In the User Preferences / System panel you will also need to enable ‘Region Overlap’