You can move your sketches by selecting them with your Apple Pencil and using the arrows to reposition them.
Although you can select each line or arc of a sketch, you can do one of the following:
- Double-tap a part of your sketch to select the entire complex sketch
- Long-tap
Optionally, you can select from the Items manager.
Then, you can use the arrows to move the sketch anywhere on the grid. 
You can even copy and move the sketch.
