If you have been experimenting with deploying different resources, you may want to delete some of them to keep things organized and to avoid being charged for resources you don' t use. This section will describe the procedure of resource deletion at various levels. Be careful--the delete procedure is irreversible.
Clean up Azure resources
Deleting a function
One way to delete a specific function inside the Function App, is to delete it from the function's app Functions list as shown in the following screenshot:
Alternatively, you can also delete by navigating to Functions State | Manage | Delete function: