Hi Walter,
so maybe i don’t understand your question/problem.
I#m just working at my Win10/DXO5/Nik4 two Eizo monitors coneected.
Left is main monitor , and I configured just at the moment for testing with all the pallets and browser on the left and move the Customize screen at right.and opened a photo in Nik Perspective Efex.
It is working like I understand