Once you have at least 1 marker selected you can modify the terrain.
To modify the terrain, hold the CTRL key and Left-Click-Drag the mouse up or down to raise or lower the selected terrain.
Additionally you can hold the SHIFT key to raise or lower terrain fast, or hold the CTRL + SHIFT keys to raise or lower terrain slowly.
Also, there are several Tools available to quickly modify the selected terrain.
See also; Controls, Tools
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