What Is the Sunrise/Sunset Button in Day/Week View?
In Day and Week views, BusyCal can display sunrise/sunset-related controls as part of its working-hours and timeline features.
In current BusyCal builds, that toolbar control is part of the Working Hours toggle UI, and there isn’t a preference to hide only that button.
Tip
If you’re accidentally clicking it when you meant to use nearby navigation controls, consider using the keyboard shortcut for toggling working hours (if configured), or clicking the arrow/toggle area more deliberately.