I installed Retroarch in Raspbian from the snap package and I found that menu, but in Lakka is not available, only the simplified version, is just curiosity, I like how it looks.
I cant’ check now on the Pi but it should be available, only it is not the default for performance reasons.
It is under User Interface > Appearance > Menu Shader Pipeline > Ribbon.
In retroarch.cfg it is:
menu_shader_pipeline = "2"
Yeah, but selecting Option 2 doesn’t change anything, that’s what I mean. I don’t know why it’s not enabled. both look like the simplified version.