Dimensions in layout space ignore model space scale now?

@pascal is correct.
Rhino 5 would scale a dimension on the layout dimension by the model scale.
That did not make sense to most users and behavior was changed in Rhino 6.

So in Rhino 6, a dimension that is created on the layout is not scaled by the Model scale value of the dimension style.

When Layout scale is not enabled, the dimension is displayed in the detail at the model scale.

In Rhino 6, the result is that the layout dimension is not affected by the model scale value:

When Layout scale is enable, in Options -> Annotation…

…text and dimensions are displayed true size , no model scale is applied.

Hope that helps.
Sincerely,
Mary Ann Fugier