That locks the camera to view, am I correct?
What is happening is I select all in Edit Mode, Say I want to texture paint but I want to paint on UV’s directly. I open a window in veiw image / set it to paint after setting up UV’s etc. If I open another to texture paint to see how its going on the mesh itself it changes the render preview up that I set up to Texture paint. So the uv’s I selected in Edit Mode disappear (when I change to Texture paint) in the image Editor even if I was going to paint on the texture itself. I have gone back to 8.2 as I was 8.3 in hopes that I could do it there. I can see where you can pin the Edit Image and some of the other windows but not the 3D viewport.
