Companion App >> Sensors >> Location Sensors shows four items. Three of them indicate whether the item is Enabled or Disabled.
The item labeled High Accuracy Mode sometimes shows a state (true or false). However, when you click on it, you are able to Enable or Disable the reporting of High Accuracy Mode.
It would make more sense to me if that item were labeled “Report High Accuracy Mode” and then it showed Enabled or Disabled.
In addition, to enable High Accuracy Mode, you must enable Background Location. If you then Disable Background Location, the option to Enable/Disable High Accuracy Mode disappears, however, the High Accuracy Mode sensor still reads true.
It seems like the UI gods might frown upon a setting that is currently hidden, yet still active.
Unless I have it all wrong, in which case I eagerly await being told to read the manual.