Long press the image (phone) or right click it (desktop), then choose Save image. Tap anywhere to close.
Make one mark, find the rest.
Draw in Shape and set Overlap to Fold: the arms cut to negative where they cross, a snowflake of positive and negative space.
Scroll to zoom, drag with middle mouse or hold space to pan, double click to reset.
Long press the image (phone) or right click it (desktop), then choose Save image. Tap anywhere to close.