I don’t know what it is.
it only shows in 5.20 in the material graph.
Is it a bug?
or need a trick to enable it?
or use ? instead it?
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Seems in 5.20, the Refraction of material default is set to Disabled.
must go to select option mode in material
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As @MilionX already pointed out, in UE 5.2, there’s a new “Refraction” Tab in the Details Panel when you have selected your material node in the editor.
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that’s right…
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Then it would be very helpful if the official documentation reflected this change. Right now Using Refraction page for 5.2 is the same as for 5.0.
Thanks for the forums! 
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refraction for some reason does not work correctly, tell me how to fix it, the glass after turning on the index of refraction becomes mirrored and not transparent and reflects the window inside itself. it looks like recursion., although I did everything according to the instructions
I spent 1 hour finding why my refraction (disabled). Thanks you very much 
gracias!!! por la ayuda, me sucedía lo mismo
thank you
Thank you buddy!
This exactly what I was looking for!) Awesome!
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