[BO 4.1] Design Studio 1.6 - Manage folders - no security option

Hello experts,

we are running SAP BI Platform 4.1 SP 5 and the Design Studio addon for BIP 1.6.

We want to use the bookmark functionality of Design Studio but we want to restrict the access to the bookmark folders.

I am logged in to the CMC as an user which is part of the Administrators-Group but when I go to "Applications" -> "Design Studio Runtime" -> "Manage Folders" there is only an option "Properties" no "user security" (see attachments).

Is there something which has to be configured?

Do you have any idea why there is no security option?

Thanks and best regards,

Sebastian Maier