In program settings (F12), there is a new dialogue window called Wire numbering
If the box enable wire numbering is checked, every new wire is numbered. If the box pad with leading zeros is checked, the wire numbers are padded up to a certain number of digits specified in the text box number of digits.
Another option is to leave the automatic wire numbering disabled and number the wires again once the drawing is completed. The renumber now button serves that purpose.