Quote - What? What do you mean "It's the SplitView thingie".

The Split View should be 0 if you don't want to see the original texture.

If you set it to 1, then you will not be seeing the result of the despec. The purpose of split view was to set it to .5, and then half is original color map, and half is despec'd. Or .25 if you want 1/4 original and 3/4 despec'd. Etc.

Oh. I see. Just looking at the lip texture, I see no discernable difference between the original and the despecced texture. Set split to PM(.5, ... and see no discernable difference between the right and left side of the texture. GC for the renderer has been turned off.

Monterey/Mint21.x/Win10 - Blender3.x - PP11.3(cm) - Musescore3.6.2

Wir sind gewohnt, daß die Menschen verhöhnen was sie nicht verstehen
[it is clear that humans have contempt for that which they do not understand] 

Metaphor of Chooks