Fix beam curvature based not on graphics quality

As I said by the title, how would I fix beam curvature not based on graphics quality? When I lower my graphics quality to 1 it makes the beam straight. While if I increase it to 4 then it actually becomes a curve like I want it.

1 Graphic Bars:

image

4 Graphic Bars:

image

How would I make the beam curve while still having low graphics? I know there’s a way to do this because I’ve seen it in other games.

Any help would be really appreciated! Thanks!