Preview "Normal and selected" layers in the background

Hello everyone!

Please help me solve the problem!
I have a problem with displaying layers.
When the active layer is a “custom preview” with a color, the “custom preview” is always in the foreground. The other layers - normal preview (red) and Selected (green) are always in the background, even when I select a layer.
I don’t have the “Bump preview” in grasshopper, I can’t find it. Version 8
Thanks!