How to restrict Impex Import/Export wizard from opening for specific users in Backoffice?

Hi Experts

We have requirement in which we have to Import restrict "System" explorer tree options from Backoffice for lets say CMSmanagerGroup. We have restricted it using User Rights impexes but still wizards keep on opening and is clickable. This is the case with all the wizards that open in a Popup like Solr Indexer, Import export Wizards etc. In the screenshot attached you see Impex Import popup,i want this to be disabled for CMSManagerUser. Can anyone guide me as to what is required to disable these wizards for particular user groups? Some documented reference will be great.

Thanks