The Reclaim Google Calendar add-on allows you to reset your policies—Habits policies, Tasks policies, and Smart 1:1 policies—after you have made manual changes on your calendar. Once cleared, Reclaim will attempt to schedule your calendar back to its original state based on your Reclaim settings.
To reset your policies
From your Google Calendar, click on a Habit Instance, Task Event, or Smart 1:1 to show the Habit or Task details in the add-on panel.
Scroll to the bottom of the panel to Scheduling Exceptions.