commerce-8.x-2.8/modules/order/commerce_order.links.menu.yml

commerce_order.configuration:
  title: 'Orders'
  route_name: 'commerce_order.configuration'
  parent: 'commerce.configuration'
  weight: -5

entity.commerce_order.collection:
  title: 'Orders'
  route_name: 'entity.commerce_order.collection'
  parent: 'commerce.admin_commerce'
  description: 'Manage your orders.'

entity.commerce_order_type.collection:
  title: 'Order types'
  route_name: 'entity.commerce_order_type.collection'
  parent: 'commerce_order.configuration'
  description: 'Manage fields, form and display settings for your orders.'
  weight: -10

entity.commerce_order_item_type.collection:
  title: 'Order item types'
  route_name: 'entity.commerce_order_item_type.collection'
  parent: 'commerce_order.configuration'
  description: 'Manage fields, form and display settings for your order items.'
  weight: -5