pm-4.1.x-dev/modules/pm_project/pm_project.links.menu.yml

entity.pm_project.collection:
  title: 'Project'
  route_name: entity.pm_project.collection
  parent: pm.admin.content_items
  description: ''
  weight: -15

entity.pm_project_type.collection:
  title: 'Project types'
  parent: pm.admin.content_settings
  route_name: entity.pm_project_type.collection
  weight: -14