lithopane question

Have upgraded and have 3.106. Am trying to use the litho viewer but haven't figured out how to 'launch' it. Have tried to find a new prompt that would help but have missed it. I have verified I have that hardware acceleration is on and that I have OpenGL 4.6.
Thx, Rick H

It is just a different wood texture. Under view - texture - lithopane

Thx, knew it had to be simple, just didn't look there.
Rick H