The Profiles section of Workspace helps you to restrict the Web access of the user’s device by black listing URLs, black listing certain URLs of a website irrespective of the domain, blacklisting or whitelisting keywords. If any keyword or URL is blacklisted, then it will not be accessible through the Workspace browser. But if any keyword or URL is whitelisted, then it will be accessible through the custom browser.
Note: For iOS devices, you can only whitelist or blacklist the websites or use auto filter.