Some menu links are defined in code, by modules' MODULE.links.menu.yml files, or in hooks. Core has a service for overriding certain aspects of these links (such as their weight, and whether they are enabled or not). Recipes can now override such links with a config action:
config:
actions:
core.menu.static_menu_link_overrides:
overrideMenuLinks:
some.link.id:
enabled: false
weight: 10
some_other.link_id: null
Let's break this down:
The overrideMenuLinks config action can only be used on the special core.menu.static_menu_link_overrides config name. Trying to use the action on any other config name will throw an exception.
The action takes an array whose keys are menu link IDs, as they would be found in MODULE.menu.links.yml. The values are either an array of keys to override for that menu link (weight and enabled are probably the most useful, but see https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Menu%21St... for the full list), or NULL to undo any existing override for that link.
This action ONLY affects menu links defined in code. It will not work on menu links that are content entities, such as menu links for nodes or any custom menu link created via the UI.
