Delete Floating IP
Before deleting the Floating IP configuration on the NAT Gateway Configuration page, make sure you have removed the Static Route configuration and NAT configuration.
Here's a guide to deleting the Floating IP configuration.
Select the Floating IP label in the Action column, and click the Delete button.
There is a Delete Floating IP window, press the Confirm button to continue the process of deleting the Floating IP on the NAT Gateway.
The notification "Floating IP [floating ip name] has been successfully deleted" appears that the Floating IP has been successfully deleted from the NAT Gateway.