It drives many crazy; but there is no option to have filters split into multiple columns. This can be done with legends, but not filters.
In 8.0 we have much more flexibility when with working with filters on a dashboard (such as floating them and assigning filters to more than one workbook within the dashboard),but we still don't have multi-column filters (at least not in the first beta release of 8.0).
Thanks for the clarification. I am certainly thinking of legends in multiple columns. Bummer. Is this a possibility for a future update. Seems only logical that if there is a need for it in legends there must be one (obviously I do) for filters.