How do I join two hatches seamlessly?

Hatches with the same angle, the same spacing and the same origin lie on the same grid — they merge without offset.

1. Leave Origin X: and Origin Y: in the dialog at their common value (factory 0/0).
2. Hatch the first area.
3. Hatch the second area with the same settings — most easily by dragging the black seed-point square of the first hatch into the second area with Ctrl held down: a copy with identical values is created.

Offset deliberately#

If two parts in a section are to remain distinguishable, give the second hatch its own Origin X in the Properties panel (e.g. half the spacing) or a different angle (135° instead of 45°).