Where is the setting for Seam Hiding?

[Rewire]

I can't find it.

Is it automatic? It doesn't seem to work, if it's supposed to be automatic. Lots of seams on my latest print, sliced with 5.0.

[studiokite]

when I look at the preview there is no noticable difference either.

[S3D-Jason]

I believe the option can be found on the Layer tab in the "Start Point Selection" section on the right. Enable the checkbox for "Restrict start points to preferred regions".

Note that this option works in conjunction with the other start point selection options. So depending on what setting you have for those other options it may work better or worse.