In your Segment.io account, navigate to Sources > Schema > Track.
Next, click on the track event name. This will take you to the settings for that Track event. You'll then click on Filters to see which apps are being sent this track event.
Turn on Promoter.io for the Track eveny you would like surveys sent on, such as “Completed Order”.
Turn off Promoter.io for all the Track events you would NOT like surveys sent for, such as “Viewed Settings Page” or “Logged In”.
This is also best practice as this makes sure that for any app you use Segment with, you're only sending the information you want them to have, and not everything possible.