As far as I know, you can't edit the default materials in the library, but you can copy and edit them, which is what I am guessing happened.
To edit the copied material:
Open or create any part.
RMB on the material and select "Edit Material"
scroll down to your custom materials (generally the last thing on the list) and see if something called 6061 Alloy is there.
When you select it, there is an appearance tab that will appear and you can change the appearance.
If so, then delete it or modify it at will.
Both of these are in the same spot under Solidworks Materials, Aluminum Alloys. The only custom materials I have saved are plastics. Either Solidworks changed the color slightly a few years back, or some sort of setting has making it look different for a while.
The copy, then edit idea might work well, I'll give it a try. Thanks.
You said you changed your Appearances.
Did you change your Scenes?
Scenes will change the overall lighting effects - intensity, shadow effects, brightness and will appear to make colors look different because of the angle, intensity or color of the light.
That's one thing I was thinking about after I posted the question. There is a shadow when I rotate a part around which I'd prefer wasn't there. Unfortunately "Floor Shadows" is checked and grayed out. I can't figure out how to uncheck it. My scene is just a plain color and I'd prefer no lights or shadows. There also appears to be a light shining on my drawing. The screen shot here shows 2 views of the same cover in a SLDDRW drawing. If I printed this, the flat view would look like a wire frame view, while the isometric would show the material. Is lighting/shadows even an option in drawings? How would I turn all lights and shadows off?