To change the XML port in XenDesktop 7.x, complete the following steps:

1. Open command prompt and navigate to cd “c:\Program Files\Citrix\Broker\Service”
2. Type BrokerService.exe /show and press Enter to show the current ports.
3. To change the XML port type, BrokerService.exe -wiport (storefrontport) port and press Enter. For storefront it would be BrokerService.exe -StoreFrontPort PortNumber.
4. The Citrix Broker Service will then automatically stop and start to apply the change.
5. Run the BrokerService.exe /show command again and validating the Storefront Port value to confirm.

Check out https://support.citrix.com/article/CTX127945 for example.