Draw Centerline will draw the selected centerline on the screen.  All the zooming commands [Zoom In, Zoom Out, Zoom Window, Zoom Previous and Pan] are available to you in the Draw Centerline command.  The program will automatically zoom to the extent of the centerline when drawn.  If there are point numbers and polylines on the screen in that area, they will appear as well.  This command only temporarily displays the centerline for reference and does not draw it on the screen as part of the dxf file associated with the job.  To actually draw the centerline as a permanent feature (unless erased later), use Map (globe icon), Tools, Centerline, CL to Polyline.