PlotScale - DrawingScale - AnnotationScale

I am a bit confused about the different named scaling options

In GSA under symbology I have the option "ApplyDrawingScale" in the help file the Description is "If checked, the current drawing scale will be applied to text size, cell size and line style scale. "  

But the Drawing scale I only can change if I activate Annotation Scale and that has an dramatic effect on the textsizes if I change the drawing scale then.

So the DrawingScale in GSA Symbology refers to the Plot-Scale ? And Annotations scale should be turn off every where ??

Could somebody please point out the correct way to handle scale

Erik