“Start week on” doesn’t change the leftmost day in Week view
BusyCal’s Start week on setting controls which day appears first in Week/Month views when you’re showing a full week.
However, if your Week view is set to a custom day range (for example, 3–14 days), BusyCal can align that range to start with today instead of the fixed start-of-week day.
Fix: Switch Week view to “One Week” (or “Two Weeks”)
- Open BusyCal > Settings > General.
- Under Week view shows, choose One week (or Two weeks).
This makes Week view consistently align to your Start week on setting.