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Twig
Edit borders
Where to find it. ··· in the zoom bar (Canvas controls) ›
Edit borders.
How to use it. Grab handles appear for the page edge (the paper
size), the margins and the sub-canvases. Grab the page edge to see
standard sizes and snap to them; choose which standard sizes appear as
snap guides.
What to expect. Showing the handles is screen-only, but dragging a
border changes the printed layout.