Speaking of additional legs, we actually mean the 4 corner posts of the bed. To have extended or shortened legs in the future, then you need to remove the old posts and install new ones.
You can choose only one of the four options. The bed will then be 3, 10, 20 or 30 cm above the floor. If you would like to add a drawer to the bed in the future, then you need the legs extended by 20 cm.
We also need to know whether you ordered the bed with or without a railing, as the corresponding holes in the legs must then be prepared.