It was a long time ago, but I don't think it was SYNC related, it just displayed there. I mostly remember it displayed mph, GPS location, longitude/latitude, and one or two other things.
Been searching for a document that described the sequence and finally found it in the cloud. It wasn't my Focus, it was my 2016 C-Max Energi.
With the car off, press the left OK button then with your foot on the brake press start. Hold the OK until ET displays in the top left corner of the left screen. Use the down arrow to cycle through the diagnostic screens. At the fifth screen will be the diagnostic test codes. If there are no codes the screen will be blank. To exit press and hold the left OK button until clear.
As I was typing, I thought the above might be something different, but I was too far in to abandon the effort. I'm going to see if this does anything on my 2020 Edge.