Hi there!
I am not sure how to report this, or how to contribute fix to the UE repo on GitHub for the Engine/Content directory. It seems that description of the GeneratedRoundRect’s parameter “Sharpness” is duplicated from “Center”.
I have noticed it on 5.6, but still valid on 5.7. Material function located at Engine\Content\Functions\Engine_MaterialFunctions01\Gradient\GeneratedRoundRect.uasset
Just a small bug report

