If you no longer need a launch template, you can delete it. This does not affect any instances that were created using the launch template. This topic describes how to delete a launch template.
Procedure
If you delete a launch template, all versions of the launch template are deleted. Proceed with caution. For information about how to delete a single launch template version, see Delete a launch template version.
Log on to the ECS console.
In the left-side navigation pane, choose Deployment & Elasticity >
> Launch Templates. In the top navigation bar, select the region and resource group to which the resource belongs.
On the Launch Templates page, delete one or more templates.
To delete a single template, find the launch template and click Delete in the Actions column.
To batch delete templates, select the launch templates and click Delete in the lower part of the page.
In the Delete Template dialog box, click OK.
Reference
You can call the DeleteLaunchTemplate operation to delete a launch template.