I'm pretty sure the mainstream view is that the moon "as a glowing disc" is entirely created by your brain. It does not mean that there is nothing when no one

I'm pretty sure the mainstream view is that the moon "as a glowing disc" is entirely created by your brain. It does not mean that there is nothing when no one is looking, just that what we see is a representation by our brain of something objective that we can't directly assess. The representation stops to exist when we stop looking. What part is representation and what part is objective is debatable. Assigning more to the representation and less to the objective solves some problems neatly, like that of quantum entanglement. Take Donald Hoffman's example of a cube drawn in perspective as lines on a piece of paper. In your mind you see a cube, but nowhere is there actually a cube. The front and back faces of the cube are entangled : if your mind has decided on the projection in which one face is the "front", the other face has to be the "back", and vice-versa if your mind has decided on the other projection.