Vertically

Supported on: Microsoft Windows XP SP2 or later
Registry HiveHKEY_LOCAL_MACHINE or HKEY_CURRENT_USER
Registry PathSoftware\Policies\Foxit\Reader 8.0\Ribbon\Ribbon_Category_ArrangeFormat\Arrange_Panel_Alignment
Value NameArrange_Alignment_Vertically
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

foxit reader 8.3.admx

Administrative Templates (Computers)

Administrative Templates (Users)