3d render not anti-aliased

Why are my 3d objects not anti-aliased in the render view? I tried to export layout image to 8k resolution but the objects are still not anti-aliased… Is there a way to fix this?
https://imgur.com/a/Kjq57My

How are you rendering your 3D object in Harmony?
If you have set up the rendering through Maya Renderman
or Arnold you should have full antialiasing because we do a
deep render.

If you are just doing a normal render without having set
up the full 3D integration then what you are getting is an
OpenGL insert of the 3D object in your Harmony scene.
There is a very basic, low quality antialiasing done using
this method but it is not recommended for final output.

Sorry I’m super late but can you explain further about rendering with anti-antialiasing in the final render?