Scene capture mat

ok so I was able to render outside the world in ue4 to remove the background on my character portrait, but in ue5 am not able to do that anymore and need to do it in the world. so my question is how do I remove the background of the scene texture mat?

what i have is this in the material of the render target:

RGB-> base color
Alpha channel → 1-x → opacity.

what do i need to do now to not render the background in ue5

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