Using it
Right-click an image node and choose Tools → Outpaint. On the connected Outpaint node:- Drag the handles outward on any side of the image. Top, bottom, left, right, or several at once. The Output readout shows the resulting canvas size live.
- Press Outpaint. The job runs in the background and the extended image lands in the node.
- Not right? Drag the handles again and re-run, or hit Reset to zero the expansion.