Administrator overview and access to user data

I have Nextcloud on the current version 27.1.4 on Debian 12.
I created an admin and several normal accounts.
Is there a way to get an overview/control of all rights and releases? So that as an admin I can control what approvals have been granted.
Is there an extension for this or is it already in the core?

Thank you very much for tips

If I get you right you want to control shares granted from one user of the instance to another? Definitely this shares are stored in the database and could be extracted there but there is no value doing so AFAIK. You can not control what the user is doing wit the documents… if you prevent secure sharing through the application they will just send the files through email or USB drive…