Something new and odd for me: in my model, I have turned off all classes that I don't want to see in a new viewport. I create a viewport as usual, but when I look at that viewport on the new sheet layer, what should be non visible classes are showing up. I've checked the class visibility for that viewport and everything is as I want. I update the viewport but still it shows unwanted classes. If I make non visible, the classes of the wanted objects, then update, then disappear as expected. But no