No plugin working once there is one shipping method
No plugin is working if one shipping method is available.
Note: Yes, if in your site if there is only one shipping method available then there is no radio/dropdown button that will showcase.
This is the default feature of WordPress that, once only one shipping method is available then it will showcase as text without the option to select it.
If our plugin is not working then, please make sure that you have multiple shipping methods available.
Case - 1: If cart contains only one shipping method.
Case - 2: If cart contains multiple shipping methods.