How to restrict access to folders to users in OwnCloud?

Question

linux

Good afternoon!
Deployed OwnCloud Community Edition on Ubuntu 16.04 and wondered about restricting user access only to those folders that I myself will give them. By default, all users have access to all folders, which is not good. I would like some distinction.
I will be grateful for your advice!
Beaver everyone! :-)

Answer 1

By default, users only have access to their own folders. You can organize users into groups and share folders for specific groups with specific rights. That is, you can give one group write access without deleting, and the other read only.

Answer 2

It is logical
at first,
but in media only .contacts-wrap
The first has a higher specificity, so it interrupts, read here

Answer 3

show on https://jsfiddle.net, not on the screenshot