Generate a terrain, hold 1 to see some variables of how much stone, coal, & diamond you got, & the max ever got. Click Create, use the number keys to select different objects, but PRESS T to select the tree. Click the "Clear" all the way right to clear it. IN create mode you can hold the mouse and place the objects, you dont have to wait.
@NotableCat @Scillog for the movement of the mouse during create mode. Google. IN CREATE press 0 for nothing.