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How to customize setup > Create > Workflow & Approvals > Approval Process
Is there a way to customize
setup > Create > Workflow & Approvals > Approval Process
I need to add another page Block under
Inactive Approval Processes
also I need to add my custom process under Create New Approval Process Drop Down

I think you are asking to modify the layout in the Setup pages, this is not possible.
Best,
Sati