Places the subform at the top of the page, whenever the specified page is rendered (introduces a page break if one does not occur naturally).
Places the subform at the top of the odd page whenever the specified page is rendered (introduces a page break if one does not occur naturally).
Places the subform at the top of the even page whenever the specified page is rendered (introduces a page break if one does not occur naturally).
Creates a new overflow leader subform in Designer ES and set it as the overflow leader when paginating this subform.
Creates a new overflow trailer subform in Designer ES and set it as the overflow trailer when paginating this subform.
See also 

Subform properties in the Pagination tab