Question UI custom Graphic has jagged lines

Hello, I created a custom graphic that lets me create polygons in the UI canvas.
The issue I have is that the lines drawn are very jagged.
https://imgur.com/a/kNZDLyr



Is there some setting I can change?
I am not using a camera in my scene so I cant use antialiasing.
is there a way I can control how many "steps" the triangles side creates?

Many thanks for reading this.