When engine is off, turn ignition to RUN, do not start.
Wait until the Oil Can symbol appears in the Trip Odometer display and the Clock symbol appears in the Odometer display - this may take 5 seconds or so. Then press the Trip Odometer reset twice and the oil level indication will appear in the Odometer display.

The Owners Manula doesn't make it clear that you have to wait a few seconds before the Oil Can and Clock appear before you can press the Trip Odometer reset twice.

If you press the reset more than twice, then 1 wrench will appear with the mileage remaining before A Service is required or 2 wrenches with the mileage before B service.