Hi Ken,
Thank you for bringing up the issue about deleting overrides from the "view" schedule page. You can achieve this by clicking on the "x" (within 'Upcoming Overrides' in the "color-bar" which shows the user's name), as seen in the attached screenshot. Then, your browser should ask you to confirm the deletion. Please email us at "support@pagerduty.com" if you have any issues with this.