Remove an On-Premises Firewall Management Center from Security Cloud Control
Before you begin
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                    In the left pane, choose Settings > General Settings. 
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                    In the Tenant Settings section, disable Auto onboard On-Prem FMCs integrated to Cisco Security Cloud. 
Procedure
| Step 1 | In the left pane, click . | 
| Step 2 | Ensure the FMC tab is selected and choose the on-premises management center you want to remove. | 
| Step 3 | In the Device Actions pane located to the right, click Remove On-Prem FMC and its managed devices. | 
| Step 4 | Click OK to confirm that you want to remove the on-premises management center and its managed devices from your tenant. | 
| Step 5 | Refresh your browser to see an updated list of available devices. |