Please help us help you and fill where relevant:
Your LimeSurvey version: [sorry, but does not tell. It is May 2026 version]
Own server or LimeSurvey hosting: Limesurvey hosting
Survey theme/template:
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How can I limit the rights of a user to certain survey groups? How can I prevent downloading my survey structures by a standard user who is just supposed to administer my surveys and to export the results? If I deselect the rights to "export" then the results can also not be exported. I want at least to limit possible loss of intellectual property to a minimum of surveys on my account without splitting the account into several sub-accounts. 
Thanks

Set permission by survey and not globally or by group.

If you want a more complete system :

1. Plugin can do it I think
2. Ask for a new feature