ZBrushCentral

Material and texture issues

Hi Guys

i have two issues :

is there a way when changing the lighting - no change the materials preview ?

example:

I want to clear all textures that I loaded. but not only from pallete but also from the pop-up window , because although pressed restore configuration""
in the texture palette, the textures is removed only from the pallete ,but textures appear again in pop-up window :frowning:

is there a way to remove loaded textures from pop-up window too ? without having to restart zbrush?

Thanks