Perpendicular surface to the edge

[jllibera]

Hi All

Maybe somebody can help me.
How I can make the left side of this surface perpendicular to the edge like on the right side.
I’ll be very thankfull for any help.
Best
Jan

attractor_v3.3dm (2.4 MB)

[HS_Kim]

Try to use your boundary to make some adjustments.

surface_attractor_re_V4.gh (13.2 KB)