If you've got a long list of campaigns, you can pin the most important ones to the top. That way, they'll always be easy to find.
To pin a campaign:
Click "Campaigns" in the top bar.
Find the campaign you want to pin. Click on the three dot icon on the right-hand side to bring up the drop-down menu.
Select "Pin."
That's it! Once you've successfully pinned the campaign, a red pin icon will show up next to the name.