Can you check these 3 things:
1. Version of the plugin. It should be 1.0.5 to have tabs enabled.
2. Follow the instruction in the documentation. It has some extra params for the tabs.
If there's nothing wrong with that, can you please post your code?
Sorry, the latest version is 1.1.0. Can you please re-download the plugin again? I've just tried your code and it works. So I think it must be the version.
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