Yes. To do this, you can either click on the edit button on the left side of that account on the main accounts screen and mark the account as a favorite, or click on the star just to the right of the edit button and then mark the account as a favorite:

Mark as a Favorite

Repeat for any other accounts you wish to view. Once complete, click on the options link on the main accounts screen and select "Show only favorite accounts":

Account Options

Show Only Favorites