Hello,
I just notice while switching "renderer" in view window they change some of my model normal sides.
For example in standard, "default quality rendering" mesh would display normals inside (so the object is transparent as I tuned off back face shading) and in viewport 2 it shows correct, but some other models will show incorrect. Thats really weird ! To find out which side is correct it only works when it is exported in Unity 3D. Then I get some parts of model invisible and some visible.