In 2023, Google Ads introduced a new design for its online interface and now shared, that the feedback from users indicated a preference for the updated design.
Consequently, starting August 30, 2024, the new Google Ads design will be rolled out globally, and the old design will be phased out. The new design will be the sole option available on desktop, though all existing features and tools will remain fully supported.
Read the official announcement: Completing the transition to a new Google Ads design.