When you check the Bleed Margin box Xara automatically adds a red border outside the page. This is the amount of space your images need to extend beyond the page if they are bleed images. You can change this distance in the text box to the right.
Leave your page size as is and not change it.
My example shows Live, Trim, and Bleed areas.
Live is used more for magazine work and indicates a safe area in which all type and graphics should be unless the graphics bleed.
Trim is the size the page will be trimmed to. If you page is A4 then this is the trim (or actual) size.
Bleed is the margin for graphics to extend if they print off the page. The portion of the graphics that extend off the page will be trimmed off to trim size.
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