The sections below explain the other changes you will have to make to achieve the effect of mirrored top and bottom margins inside and outside of the page when viewed in portrait orientation.
Explain inside outside and gutter margins.
Every page has three outside margins top bottom and side and one inside margin also called the gutter.
The gutter margin is a typographical term used to designate an additional margin added to a page layout to compensate for the part of the paper made unusable by the binding process.
In a facing pages layout word refers to this type of layout as mirror margins the gutter margin is on the very inside of both pages.
So if after you entered a value for the gutter margin you choose normal in the multiple pages list and you later printed the document on the front and back sides of a sheet the gutter margin can only prevent text from being obscured on only one side.
That is the inside margins are the same width and the outside margins are the same width.
But on 9 mar 2010 book page layout for a long narrative you wrote you want to keep the inside margin the one in the gutter or at the binding smaller than the outside because when the book is held open this will essentially double in size combining the inside margins of both pages in a space in the middle of the book.
Change the margins of the landscape section.
For more information on bleed see our print options help page.
The gutter margin is a typographical term used to designate an additional margin added to a page layout to compensate for the part of the paper made unusable by the binding process.