How do I favorite accounts and keep them at the top of the list?

In the Manager's account selector, each account has a star next to its name. Click the star to add an account to your favorites, and click it again to remove it. Favorite accounts appear in a Favorites section at the top of the list, including inactive accounts, so it's easier to find the accounts you use most. Favorites are saved to your Ads Editor account, so they work in any browser or on any device where you sign in.