In Horizon Administrator, after you set the policy at the desktop or application pool level, you can override the policy for a specific user in the pool by selecting the User Overrides setting and selecting a user.You cannot set this policy for individual published desktop or application pools. Only the global USB access policy is available for published desktop and application pools. With this approach, you do not have to change the desktop image and can control access to USB devices in specific desktop and application pools. In Horizon Administrator, edit the USB access policy for a specific pool to either deny or allow access.(The option is deselected by default.) This approach prevents access to USB devices on all remote desktops and applications that are deployed from the desktop image or RDS host. When you install Horizon Agent on a desktop image or RDS host, deselect the USB redirection setup option.Use any of the following strategies, as appropriate for your situation: You can disable USB redirection for all desktop pools, for specific desktop pools, or for specific users in a desktop pool.
Some highly secure environments require you to prevent all USB devices that users might have connected to their client devices from being redirected to their remote desktops and applications.