On the Fusion Lite
Swipe to the left of the time/date (and battery %) screen(s) to select "Apps" , then scroll to the second Apps screen to select the settings icon . Swipe to "info" (i) and tap to select, and then swipe to see the SW xx.xx screen.
In the App
Tap the gear icon on the gray device banner found at the top of the app home screen, then scroll down to select 'Debug Info':