The Z key is used to temporarily zoom into a part of the drawing. This…
Vectorworks Tip #130 – Interactive Settings – Snap Box
The snap box is the area around your cursor that allows Vectorworks to snap onto objects. If you go to your Vectorworks preferences you will find that you can change the size of the snap box and change the size of the selection box (this is the area around the cursor allows you to select objects). Changing the snap and selection boxes can make it easier to draw, but you must try these out, because changing them too much can make it more difficult to draw.