Since it is stuck on this display, you cannot do anything at all. No selections are available.
Have done the following:
If the printer is stuck at cleaning the fixing assembly, it looks like something is wrong with the hardware. You can try unplugging the printer from the power and then pressing the power button 10 times while the printer is unplugged. After that, you can plug the printer into a different power source and you can try turning it on.
If you continue to have the same problem, the printer would need service. You can use the link HERE to access you MyCanon account to check your service options or you can contact support at 1-800-652-2666.