Remove from FortiManager

Hello, I have two FortiGate systems here that were managed by FortiManager. Now I want to detach the FortiGates from FortiManager and configure them independently. Can I remove the binding on the FortiGate itself and later remove the configuration in FortiManager? And above all: Does the FortiGate restart or can I unbind the FortiGate during operation? config system central-management set type none end

regards