How to discover all computers on the network Sophos XG 330

hello everyone,

please I was using in my network Fortigate firewall and there is a feature called device inventory to discover all computers. and now we change the firewall to sophos and i configured all but i want to add all computers and deploy policies on them but it's too much, so I need to know how to discover all computer on the networks from Sophos xg 330

can u please help me for this

thanks in advance