Here is the demo - Babylon.js - Multi views demo
If I set any scene.clearColor in the code, all canvas blink when reloading the page and then show again default color.
That’s the scene.createDefaultEnvironment(); call which is creating a box, so what you see is not the clear color but the box color. If you comment this line you will see that the clear color is correctly taken into account.
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you can also tweak the default environment main color 