You can adjust your Coach Settings from within your Settings menu. To access this, go to Settings > Music & Coach.
Down the page, you will see Coach Settings. Here you can do the following:
1. Toggle Intro/Outro and whether you'd like your coach to greet you when you start and congratulate you when you are done.
2. Toggle Task Time Reminders as you approach the time you've allocated for a Task.
3. Toggle Distraction Nudges when you appear to be distracted
In your Distraction Nudges section, you can choose which applications you would like to count as unproductive while flowing by hovering over the application and selecting "-" (minus).
To add an application back into your Distraction Nudges, click the "+" (plus) button at the bottom of the Distraction Nudges Window.