Sub tabs similar to Media library I am trying to replicate the user interface Media library provides in 8.8.

I've created a view with 2 displays:

View 1:

Menu tab where Parent is "Content"

/admin/content/media-image

View 2:

/admin/content/media-image-shared

No menu in the Views UI.

I've then defined:

custom_media.image_space:
  title: 'Images'
  route_name: view.media.page
  parent_id: view.media.page
  weight: 20

custom_media.image_shared:
  title: 'Shared images'
  route_name: view.media.shared
  parent_id: view.media.page
  weight: 20


The main tab next to Content / Media / Files / Images is present. However, the subtabs on my view Images are not displayed.

What am I missing?
Figured it out!

The parent must be the Views local task id for both definitions.

So parent_it should be views_view:view.media.page