It's not possible to delete a collection when it contains events. Delete events, or move them to a different collection, first.
If you don't want to delete events in a collection, you can Archive the collection.
How to Delete a Collection
To delete a specific collection in CalendarLink.com, follow these steps:
Log in to your CalendarLink.com account.
Navigate to the 'Collections' section in the main menu.
If a collection is empty, a red Trash icon is available on the right side of the event.
Confirm the deletion when prompted. This action is irreversible.
How to Archive a Collection
To archive a specific collection in CalendarLink.com, follow these steps:
Log in to your CalendarLink.com account.
Navigate to the 'Collections' section in the main menu.
Click on the collection you want to archive.
On the right bottom of the screen there's a "Archive" section available.
Click on the red Archive button to archive a collection.
Confirm the archive when prompted.
To unarchive a collection, click the blue "Unarchive collection" button on the right side of the screen.