Review: Drupal Core Making Navigation the Default Admin Experience Instead of Toolbar, with Developer Impact for Admin UX, Contrib Compatibility, and Site-Builder Workflows
Drupal core is not just experimenting with a new sidebar. It is steadily moving the admin experience from Toolbar toward Navigation, and that has real consequences for Drupal 10/11 teams that maintain custom admin UX, contrib-heavy stacks, and site-builder training materials.
The timeline matters. Navigation was introduced as an experimental module in Drupal 10.3.0 on June 21, 2024. It became stable in Drupal 11.3.0 on August 4, 2025. Then, on March 3, 2026, core issue work landed to add Navigation to the Standard install profile and Drupal recipes so new installs move toward the new admin model by default.
That does not mean Toolbar is gone today. Core's own issue queue still treats accessibility as the blocker before a full replacement. The practical reading for developers is: the direction is decided, but production rollout still depends on unresolved keyboard and assistive-technology gaps.