There isn't any granular level permissions around the QlikView Expressor repository - you either have access to store, save, create, export projects etc - or you don't.
You can learn more here:
The other option is to use a File Based workspace where you can then use Windows file-based permissions to control access to the projects for those users. You could put the workspace on a server and use a mapped share or UNC for example as the file-based repository.
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