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New Stitch or Saved Recipe
Step 1 offers two ways to start. Pick "New stitch" to select stacks and align them by hand, or "Apply saved recipe" to reuse the placements from an earlier stitch.
New Stitch
Select two or more stacks and put them in order
Align each junction yourself in the next step (Align)
Composing saves a recipe alongside the output, ready for reuse
The Next button reads "Next: Align"
Apply Saved Recipe
Choose a recipe file saved by a previous stitch, then swap its slots for the volumes you want to compose now
Alignment is skipped entirely, the Next button reads "Next: Compose", and you go straight to composing
Picking a recipe file and swapping its slots is covered in "Applying a Saved Recipe"