By default, VMware Cloud Foundation uses NSX-T Data Center to create application virtual networks (AVNs) and deploys vRealize Suite Lifecycle Manager to these AVN unless you disabled during bring-up. If you want to deploy vRealize Suite Lifecycle Manager to a VLAN-backed network have a look at https://kb.vmware.com/s/article/78608
I recommend to test this is in a lab/test environment and make backups of SDDC manager before you proceed with the change.
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