The layer that you are currently working on is called the Active Layer. The active…
Vectorworks Tip 298 – Quickly Changing The Active Layer
There is no image for this, I didn’t think you need one. To quickly change the active layer, hold down the ctrl key (Windows) or the command key (Macintosh), then use the up/down arrow keys to change to the next active layer. I find that this is a really quick way to scroll through the layers of a project.