This is the Rhino 5 default for the Shaded display mode:

The same way as you must have done that in Rhino 5.
Rhino Options > View > Display Modes > Shaded → Lighting scheme → Custom lighting → Customize…

-wim
This is the Rhino 5 default for the Shaded display mode:

The same way as you must have done that in Rhino 5.
Rhino Options > View > Display Modes > Shaded → Lighting scheme → Custom lighting → Customize…

-wim