For a single Switch or multiple Switches in a Zone, you can change the firewall management to the cloud management.
To change a firewall-managed Switch to a cloud-managed Switch
Navigate to Device > Overview and delete the Switch from the firewall from the Physical View tab.
Do Factory Restore Defaults via CLI.
This reboots and restores the device to the default configuration.
Remove the switch from firewall and change the switch DNS to point WNM after factory defaults
Register and change the managed option to cloud in MySonicWall with WNM license.