These Dimensionned grid lines are coplanar with a slab so the lines don’t print where that slab is, even in Wireframe mode.
When I move the lines down 20mm, new dimensions are added by Rhino, and some are changed.
I am redoing and undoing the move of the lines in the gif below. (They’re moved when they’re highlit.):
I can’t tell what’s going on. I’d dimension them in Layout Space, but those dimensions shift every time I activate the View Window. (There’s another post trying to get to the bottom of that.)