Set Elevation at Edge

Is there a way to make sure that the elevation at the edge of the world is 0?

I’ve tried to use a Line in Layout View around the perimeter with a altitude of 0 m but that didn’t work. How would I go about doing this?

Thank you in advance for your help.

[EDIT]
I found a way to do this by selecting:

  1. Advance Perlin device
  2. Layout View
  3. Overview
  4. Attach new Layout as Height Adjustment

During step four two options may be available (Layout as Height Adjustment, or Layout as Mask Input) depending on the device selected.

Afterwards, I was able to add polygons around the perimeter of the world with the desired height value (0 for my needs).