Why is my printer showing offline on my Mac?
The reason for Printer is offline error on Mac could be due to various reasons, ranging from the simple case of printer going into sleep mode to incorrect printer settings and problems with USB ports or the WiFi network.
How do you switch printer from offline to online?
Select Start > Settings > Devices > Printers & scanners. Then select your printer > Open queue. Under Printer, make sure Use Printer Offline is not selected.