How to interact and click through the window from godot

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Like so what I’ve been getting an idea on is a sort of desktop environment where should be able to have some UI over the real desktop and still be able to see and click through it and interact with programs beneath it perhaps if not over certain UI.

I’ve looked around and found OS.set_window_mouse_passthrough() and apparently it needs to define a polygon shape via an array of vector2’s. However when using it, it seems that what ever is defined are not properly displayed beyond the boundary and cannot click through the boundary.