I have a very large and complex Keyshot file with multiple studios and hundreds of parts.
Within the Studios window there are a whole ton of Multi-Materials in the drop down box. Most of these need to be deleted / removed but I can't figure out how to do this.
There are about 25 multi-material ...clusters or whatever you call them, and there should only be about 3.
Find the in-scene materials list. You can sort them there. But since materials can't be 'deleted' from parts, you have to apply something over them or link them to something else.
Just close the multimaterial by the button and only the applied instance will be as active material