Deleting individual Focus Time events in the extension
To delete Focus Time, click on the event in your calendar, then click on the Remove this Hold button from the event details view in the Clockwise extension. If you delete the blocks from any other location, they will be recreated.
Deleting individual Focus Time events in the web app
If you're using the web app, find the link to settings through the event details in your Google calendar.
Select the Remove this hold button for the Focus Time event you wish to remove. If you delete the blocks from any other location, they will be recreated.