I don't think you can turn off cadence? HR is optional cadence is automatic (I thought). On the TomTom you cannot see your lap splits, you have to upload everything to a computer (including cadence) to see these.
All you see on the watch (after running) is the total time, and distance. For the splits or anything else in a run you need to use the MySports page. Pin the video explaining what they had done after this started happening, you can see the TomTom data. It has all already been uploaded to a computer.