To open Data History, tap an existing data field in the Timeline Info panel, or tap any recorded data entry in your timeline.
From the Data History page, tap the Settings icon (the small gear) in the upper-right corner, then select Units. You can choose from the units available for that data type, such as kilograms or pounds, centimeters or inches, and Celsius or Fahrenheit.
From the Data History page, swipe left on the entry you would like to change. You can then select Edit or Delete.
To control whether an entry appears on your timeline, tap the eye icon in the upper-right corner of that entry. You can also change the Show on Timeline setting from the Edit page.
Hiding an entry removes it from the timeline view without deleting it from your Data History.