Peter
If you let the sensor time out (after 7 days), then you do much the same as with the Dexcom 3. Click through the 1-hour, 3-hour, and 9-hour screens. Then press and hold and you’ll get an animated screen that shows a finger inserting the transmitter into the sensor with an OK? message. Press that and after 2 hours you’ll get the usual prompt.
If you don’t wait for the timeout, but want to restart slightly early then you have to click through all the screens, press and hold and then click through all the setup screens until you get to an animated screen that looks like someone pitching a sensor in the trash. Click that and then follow the first set of directions.
I’ll blog post this later with some videos, so it’s clearer what the sequence looks like.