Which window is chosen for the preview in Windows?

I have a large patch with 2 renderers for the main output. One of those renderers is usually hidden using Window (Windows) and by having its size set.

The problem is that if I Alt + Tab in Windows and if I hover over the icon in the Taskbar I don’t get a preview like with any other software, which is a shame.

Does anybody know which windows “gets chosen” by Windows to be the one that is used for the preview? Is it the one with the lowest Window Handle? Here is the list of windows:

Right now it always chooses “GUI Renderer” for the preview and not “Renderer” (which is always visible). Here is what it looks like when I use Alt+Tab in Windows 10.

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