On the Campaign navigation pages, there is a section called My Favorites where you can save shortcuts to any campaign that you want quick access to, such as an often-used Campaign or currently active Campaign.

Location of “My Favorites” on the Campaign navigation pages
To add a Campaign to My Favorites you simply navigate to where the Campaign is located in the Campaign navigation structure and click the Cogwheel () icon on the right side of the row for that Campaign, and then on [Add Favorite] in the context menu that is shown, like in the image below.

Adding a Campaign to Favorites