There appears to be only a workaround to return to the watch face while in an activity - and thus to access important information like Intensity Minutes, Weather etc.
The workaround is holding down the UP button, going into the Settings and through to reapplying the current watch face...
Pressing or long pressing the BACK button does not work, even when it is disabled as a Lap counter; nor can Hotkeys be set.
Surely this is a basic function and should be possible without a workaround?