First of all I don’t know why you have to use 2 different types of screen space. Screen Space Overlay - just like its name - will draw above everything.
If you could change both of them to Screen Space - Camera and use 2 cameras for that, with clear flags set to Depth Only and the second one has a greater depth value than the first, you can sort it
I know this thread is from way back back maybe someone can help me here. I’m creating an interactive map which is only a part of my whole screen. Meaning I want to zoom in on a window within a window child of the first one. I’m checking about using two canvases and two cameras. What’s the best way to do this?