Follow this guide if you have first reviewed Restrict SharePoint folders from certain Users and you have more than one group of users that you would like to hide folders from.
Navigate to s.uconn.edu/sharepoint and click on your SharePoint site.
Click the Settings gear icon in the upper right. It may take a moment for this icon to load.
Click Site Permissions.
Click Advanced permissions settings.
Click on the group in which you would like to remove users.
Check the checkboxes of those you want to remove.
Click Actions and Remove Users from Group.