commerce-8.x-2.8/modules/store/commerce_store.links.menu.yml

entity.commerce_store.collection:
  title: 'Stores'
  route_name: 'entity.commerce_store.collection'
  parent: 'commerce.store_configuration'
  description: 'Manage your stores.'
  weight: -10

entity.commerce_store_type.collection:
  title: 'Store types'
  route_name: 'entity.commerce_store_type.collection'
  parent: 'commerce.store_configuration'
  description: 'Manage fields, form and display settings for your stores.'
  weight: -5