You can add URL pattern addresses and address groups to control the destination URLs that explicit web proxy users can connect to. To add a URL pattern to go to Policy & Objects > Objects > Addresses, select Create New and set the Type to URL Pattern (Explicit Proxy). Add a URL or URL pattern that defines the URL or URLs that explicit proxy users should be limited to. Set the Interface to any.

For example to limit access to a single website:

To limit access to websites from the same domain:

To limit access to a part of a website:

To add a URL pattern group, create several URL pattern addresses then go to Policy & Objects > Objects > Addresses, select Create New > Group and add URL patterns to the address group.

Then when creating explicit web proxy policies, select the URL pattern addresses or groups as the destination address.