My script doesn't have a clear start or end point. How do I set one?

You can set start and end points in Run Lines mode.

1. Go to your script in Run Lines.
2. Swipe right on the line where you want to start → tap the orange arrow →.
3. Scroll to where you want to end → swipe right again → tap the orange arrow ←.
4. Everything between those points will stay active; outside lines appear dimmed.
5. To reset, swipe right on either arrow and tap Reset.