Next Workout disappeared from Home Screen

If you mean a Training Plan workout, then scroll down, tap Edit Home » enable Training Plans

If you are referring to "Garmin Coach Plans", it's enabled. And I can see it at the bottom of my home screen.

In the past I was able to see "Next Workout" at the top of the home page, but not anymore. I am trying to get it back.

And do you have any next workout scheduled? Which kind of workouts do you use? Training Plans, self-designed workouts, workouts selected form the Workouts menu, Daily Suggested Workouts? 

BTW, you will be better advised on the Android forum. You posted to the GC Mobile iOS forum, which is dedicated to the iPhone app.