PageSetup.SectionDirection (Word)

Returns or sets the reading order and alignment for the specified sections. Possible return values are wdSectionDirectionLtr - Displays the section with left alignment and left-to-right reading order, wdSectionDirectionRtl - Displays the section with right alignment and right-to-left reading order.

ActiveDocument.Sections(1).PageSetup.SectionDirection = _ 
 wdSectionDirectionRtl