Here's the project code with three examples:
https://hitorisensei.itch.io/unreal-project-example-top-down-360-mouse-targeting
- the "Look at mouse" which always points the attack at the direction of the mouse
- the delta-derived attack angle, which changes only when player moves the mouse
- ...and version with easing added
I've never shared the whole projects before, but I hope it will work :D
I can drop the compiled version too, just need to know the system you are using.