1.0 What It Actually Does
See it in action, PBR Checker is a reference actor that follows you everywhere stays on the bottom-right of the screen, its switch to follow the camera or not is always enabled by default, on all debug modes you can turn it off to keep it somewhere in the level.
When you have multiple 3D Viewports & its following the camera, DrDebug automatically hides it on non active viewports which only DrDebug does that.
It keeps following the camera, also when you use RMB+C or RMB+Z to change Field of view, it uses seamless math to change its distance to stay in the same position.
You can turn it on on all modes, or with modes off.