Workbench request goes to aother

When I am creating New request . It is going to new Workbench Earlier It was going Local Change Request but Now It is doing to PRD Production system.

Now I am unable to release Request that are in Local Change Request.

Workbench Workbench request

Local Change Requests

Modifiable

-> PRD Production System

Modifiable

Customizing Customizing request

How I activate Local Change Request