Unfortunately it is not possible in the current alpha release. It is on our todo-list though.
Right now you have to move each drawing one by one. If you put in some kind of mark (a dot somewhere to the side of the canvas) you can use that to aim and place every drawing precisely. To place the same dot on all you drawings in a layer, pick it up with the lasso, select all drawings in the layer in the x-sheet – and stamp it. I hope this helps you just a little, even though I know it is not exactly ideal right now 😉