How do prevent a user from accessing a specific company folder?
Problem - How do prevent a user from accessing a specific company folder?
Solution description- In order to prevent a user from accessing a specific company folder, the following steps must be taken:
In the counterparty directory, click Edit. On the Additional Information tab, specify the access group. Save. 
It is necessary to do this for all companies that this user is not allowed to see.
Go to Administration – Users.
By right-clicking on the username, select Edit.
Go to the access rights.
The user has several profiles.
By clicking on each profile (it should turn colored), set the type of access to the company groups: all are allowed in the upper right window,
and a ban to the desired group in the lower right window.
Every user profile should have this type of access.
Companies included in the group you specified will not be visible to this user.