Front, I think. I don't recall, so here's another screenshot of a different area of my board with front selected.
I don't think of the colours "mixing" so much as the layers are translucent. So when green pours and traces pass in front of red pours and traces (since that is what it appears to be doing in the above screenshot), you see red through green which is kind of orange-ish. When red appears in gaps in the green, it is truly red. This is why I suddenly got disoriented when I poured copper!
Translucent traces is an incredible feature that the CAD software used at my workplace does not have, much to my chagrin! But still, the layers they're on is confusing ...
On default canvas, it's like back/green copper is permanently selected -- it's always "in front," like it is in the second image you provided.
The white layer will be "drawn last," on top of everything else.
So what you're saying is this visual tool for generating PCBs does not accurately show layers on the correct visual layer ... like I said above, it doesn't seem to mix colours so much as simply have translucent layers.
You are brilliant! This is what happens when I put text here:
turns into this (top/front/red side, switches and display should indeed be on the front as shown):
and this (bottom/back/green side):
Looks alright! (I know my switches aren't in the correct positions, that's because I changed the reference on the footprint to move the switch on centre rather than on Pin 1, and didn't change the 3D model to match.)
Less efficient ... rendering is already quite fast, so does that mean my laptop will get better battery life on OpenGL? Thanks for your brief overview of canvases -- they don't really change anything about the board, then, they're just different ways of looking at it, and enable features. I was wondering why I couldn't use the auto-router ... now I know why (default/legacy canvas).
Clearly, it's green over red. Allow me to illustrate my point with OpenGL (yay! I learned something new!) on the same section of my board.
Front/red layer selected:
Back/green layer selected:
In the first image you're seeing green through the red, which (according to all of you up above) is the correct way things should be and how the board will be built, which means I don't have a problem and don't have to re-route most of my board. Glad I stopped by the forums before starting that ...
In the second image you're seeing red through the green, which is not how the board will be built and caused me much pain over the last two weeks! The default canvas displays layers like this, as if the green layer is always selected and in front. Go back to the top of this post and compare the default canvas screenshot of this same area -- it looks like the 2nd OpenGL screenshot here.