Water

The main control is a Level slider. Raise it and water fills every part of the terrain that sits below that height; lower it and the water drains back out. You are not painting a lake, you are setting a height and letting the shape of the ground do the rest.

This is why Sculpt and Water are usually used together. If the shoreline is in the wrong place, the fix is normally to reshape the ground rather than to move the water.

When the water system in your world publishes more than one look, a picker appears so you can choose between them.

The Advanced disclosure is built from the water system’s own controls rather than from a fixed list we wrote. What you see there is whatever your world’s water actually exposes, under the names it uses.

A world with no height range in its ground has nowhere for water to rise to, and the panel says so directly rather than offering a slider that would do nothing.

If you see that, sculpt some ground first — a basin, a valley, anything with a low point — and come back.