Layer Materials question

How can I efficiently manage my material drop-down window in complex scenes to prevent it from getting bogged down when I import new assets that bring other materials with them? Can the material drop-down window be purged in Rhino 7 in any way to improve productivity? I’ve added a screenshot to show what i mean. This is a blank canvas, I thought i had saved only the geometry. yet in brought all these material and material copies with it.

Thanks in advanced.




will get rid of unused materials

in the material tab, you can also find an option to only display used/unused materials

another somewhat related option is to create material “tags” and display only materials that you filter via searching for these “tags”