I am seeing all kinds of scaling oddities in layouts.
(1) As I previously reported, scaling of line style appears to have no effect in layout mode,
(2) If create a custom line style, the settings I use appear to have no effect until I close the file an reopen it.
(3) Hatches appear to be scaled in layout model. Is there some setting to make the appear the same in model and layout spaces?
(4) Here I have two plans in the layout with the same scaling (1:192). I created a custom line style in inches of 0.25, 0.25 in both. Yet in one file, the dashed line was nearly solid. As shown, I have set one to use 0.025, 0.025 to get roughly the same scale. I am puzzled why I have line scaled with a factor of ten difference showing up roughly the same size; leaving me with the problem of how to get consistent lines across multiple files.
Another layout oddity.
I am seeing custom line styles in created in inches being converted to mm with the same value. I’m trying to track down exactly what causes it.
From your description, these appear to be the same issue.
I’ve tested this in 5 different ways but can’t seem to get it to fail here on a current build of Rhino 7.
The on-screen size of an arrowhead is constant and that is documented in the help file.
We have an open feature request for arrowheads with sizes and I added your vote - RH-37989.
-wim