remove firewall licenses from Sophos central

Question

Hello 
 Good Day for every one 
 i need to remove licenses to old device but i cant do this look to photo in attached

Mayur Makvana · Answer

Hello, 
 You can deregister using below: 
 https://docs.sophos.com/central/customer/help/en-us/ManageYourProducts/GlobalSettings/NetworkUTMs/index.html 
 Go to My Products > General Settings > Registered Firewall Appliances . 
 You can see Sophos Firewall devices that have been registered with Sophos Central. You can also deregister (or "disconnect") them.