OK - I created a new layer in that view; added the Sketch to it and hide the NEW layer.
That seems to be working fine. I still do not know what was going on though.
As a test - I tried setting the option draw_layer_overrides_model = YES
I got the same results as below except that the sketch wasn't hidden in the ASM, which seems backwards to me.
Then - I reset draw_layer_overrides_model = NO and ignore_model_layer_status = YES (back to the defaults)
I located the ALL_CURVES layer (of the view I was working on) and hide that.
It worked; as one would expect, all the curves became hidden in only that view.
Since I wanted to keep some of the curves within that view I expand that ALL_CURVES layer, located just the sketch I wanted to hide.
Clicked hide and it disappeared from every view.
That shouldn't happen - Right?