Once the extension is enabled, if the order amount is less than the minimum order amount setup at the backend, a sticky note will be available informing the amount remaining for free shipping.
Let’s suppose the minimum order amount is set to 100$, and if the customer adds a 75$ product to the cart then the sticky note will display the message that 25$ is left for free shipping.
If the cart has the minimum order amount as set at the backend, sticky note will display the message that the customer is eligible for free shipping.
Also, free shipping method will be enabled which the customer can now opt and no shipping/handling charges will be applied.