How to render Attack Area preview

Hi guys,
I plan to make my enemy to preview it’s attack area and then after 3 seconds only apply damage to player if they can’t
Dodge the attack.
However I have no idea how to render a green highlight on the floor to preview to attack area like the one in the image. Does anyone have any idea on how to do it? I would want the floor to be color like when we turn on debug mode to show nnav mesh area(green color for floor that nav mesh cover)

Image: Unreal attack area preview - Album on Imgur

Any help will be appreciated. Thank everyone who can help, I’m new to developing game T_T.

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I’m actuially trying to do the same thing and i came here for an Answer. Following