The "My Sites" Drop Down Is Too Long for Display

WordPress Multisite 3.2.1.

I have created a multisite network that is now approaching 30+ sites. When I click the “My Sites” dropdown from the main network admin, I can no longer see all the sites, as there are more than can fit on the screen in a single column. How can I modify multisite to have the sites ALL show, say in multiple columns? Any help will be appreciated. Thank you.