Hi @Harry N Nomikos ,
Welcome to Q&A forum!
Unfortunately, there is currently no way to hide list views across the top panel via JSON. Currently, the thing that can be customized via JSON is the Command bar.
The list views tab is used by users to switch between different list views. It is a design of the list new experience. If this bothers you very much, we'd suggest you submit feedback on this issue. This is the best platform to let us hear from you and make our products and services better for you and others. Microsoft values its customer feedback and a lot of features have been developed and suggested by customers via feedback. Your feedback is also very important.
Good day!
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