If you have more than one audience, you can reorder them on the list of audiences page to prioritize the ones you work with most. This will also change their order in the Current audience drop-down on the Campaigns, Audience, and Reports tabs.
In this article, you'll learn how to reorder your audiences.
Click and drag the three vertical dots next to the audience's checkbox and drag the audience where you want it to appear. You'll see the Drop here text when the audience is in a position it can be moved into.
Release the mouse button to drop the audience into place.