Few model railway layouts are entirely on the same level. Fortunately, AnyRail can handle track at varying heights.
If you want to make sure that the height of a certain point is not changed accidentally, right-click it, and select Lock height.
The point turns blue and yellow to indicate that its height is locked:
When the height is locked, the connection is colored blue and yellow, and drawn as a diamond. Also, a lock is shown in the status bar when hovered.