How to make a round decal?

I try to use a decal for the character movement indicator. In the preview, the decal material is round, but in the game it is square, why?

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Hi!

I’d guess you’ll need to go lower with the radius… /on the screenshot it looks round but “cut” into a square…

Doesn’t work.

Dont use decal component , use decal actor

i have the same problem…hmpf. really weird. didnt find any solution.
decal actors are no option in my case

If anyone wanders into here years later like I did, here is a quick video that helped me: Unreal Engine Tutorial | Circular Ring Material (without textures) (youtube.com)