How to hide this effect with UI Drag Detectors on mobile?

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Hello there.
I was trying to implement a UI Drag Detector in my game, but ran into a small problem:

image

The white circle in the image is a frame with a UI Drag Detector inside which works fine, but on mobile devices it creates this annoying blank semi-transparent gray circle when I start dragging, how do I get rid of it?

I’ve tried setting ActivatedCursorIcon and CursorIcon to different images, but seems that doesn’t do anything.