This is mostly me repeating myself 
but hopefully something clicks for you.
Search results for ‘"free ride to focus"’ - Xert Community Forum (xertonline.com)
The Focus target outdoors is similar to recommended indoor workouts. It’s just a different way to get there by performing irregular intervals that achieve the same strain goal for the day.
While the intervals may be irregular in duration, they do have structure to them.
The Focus field on Garmin provides the target focus to shoot for while the TTE/TTR field helps you gauge RIBs and when to go again.
For example, you can free ride intervals that closely target your 5-minute power (Breakaway Specialist) sandwiched between your warm-up and cooldown portions of your ride. Or the entire ride is slow and easy to meet the endurance goal for the day (Focus: 20:00+).
With a 5-minute power target you’d ride intervals at or slightly above your 5-minute watts on your power curve. Doesn’t have to be exact. They won’t be 5 minutes long as that would drive you to complete exhaustion. 
Recovery RIBs should be low watts (ex. 60% TP) so TTR returns close to zero. Then go again.
You also keep an eye on your XSS goal for the day.
When you return and upload the ride, the activity title and details tell you know how well you matched goals for the day.