These are actually really hard or impossible to achieve in World Machine procedurally since those mountains follow a very accurate and realistic big scale hydrological river system.
World Machine right now actually works better for up close mountains like this rudimentary scene I made as an example:
To demonstrate what makes it impossible to create such shapes as of right now this is what the scene I made looks like at a distance
As you can see it follows no realistic structure.
The most feasible solution to this would be to write your own device with the SDK to generate fractals, which actually resemble the branching structure of real world river systems.
But if you are patient enough there seems to be another solution on the far horizon: on one of the latest blog posts Stephen secretly shared images of a new river/erosion system he has been working on (i presume), here is an image he teased us with:
With this new system you probably would be able to recreate something that resembles the screenshot you sent.
Last but not least I recommend you to use real world data, like SRTM, which can be easily downloaded from here https://terrain.party/