Hide curves-in-surface

I want to extract the curves on the surface shown in the figure, or at least to hide them, and do so in the current display mode with the grid visible. “selcrv” does not divorce them from the surface entity, and I’ve tried poking around in “Visibility”. I’m using Rhino8 on a Mac Ventura.

in the
_displayProperties

uncheck tangent edges
uncheck tangent seams


this is the same as setting the visibility in the display Mode via options

and there is some fine tuning in the Object - Surfac - Edges settings (there should be more info in the help, but I did not check that)

It worked it worked!