Add a toggle for Fast GI Approximation in the header of the panel, following Cycles layout. Move the `Max Roughness` setting inside the panel, and rename to Threshold. Since Fast GI Approximation only has any effect when Threshold/ Max Roughness is below the max (1.0), gray out the rest of the panel when at that value. Co-authored-by: Clément FOUCAULT <foucault.clem@gmail.com> Pull Request: https://projects.blender.org/blender/blender/pulls/125452