Ive tried to allow All users to have an access to all existing spaces and could`t find where I can do that. Im login with administrator I go to Users menu and there is no option to assign users to spaces - there is a button in right up corrner "Bulk Edit Spaces " and when I click on just redirect to <domain>/people?bulkedit. but nothing happen.
Then I go to Spaces and again the same - no option to assign users.