In order to ease the burden of manually placing all the nodes, Dessin contains the mechanism that will lay them out automatically.
To activate it open node menu that you want to place automatically and swipe upwards. Buzzing sound will confirm that it is magnetized.
Magnetized nodes keep the distance from their neighbours within reasonable range.
After magnetizing one node, try moving nodes that it is connected with - you will see that it will follow them.
In order to save battery, magnetized nodes are put into sleep when they are finally placed correctly. They are waked when any of their neighbours gets moved.
To demagnetize a node swipe upwards from its node menu. The same touch will let you place the node in the right spot.