how to make the background transparent so you can see the desktop?

how to make the background look transparent to see the desktop or anything else you want

please help me I’m starting to see the word transparent everywhere

This is where I got further.

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You can’t,UE4 render to viewport not in to desktop composition, because of that it can’t be partly transparent (maybe Windows support it but UE4 RHI don’t). But you might do something in C++, capturing desktop somehow and place it as a texture as background.