Change Canvas Size
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Use the Image > Canvas Size command to bring up the Change Canvas Size dialog.

This dialog lets you enlarge or reduce the drawing area for a particular frame without changing the size of what you've already drawn.  You can fasten down a corner of the existing image with the Anchor buttons, and the new space will be added on the sides opposite the anchor.

To squash or stretch the image contents while you change the frame size, use Image > Image Size instead.