What does "Who colors it" change?

It sets the line weight and the smallest space the print check allows, and every page is drawn and measured for it:

• Toddlers (2 to 4): a few huge shapes, very thick lines (6 pt usual; 5 or 7 pt), spaces of 130 mm² and 8 mm across or more.
• Kids (5 to 8): big spaces for crayons, thick lines (4 pt usual; 3 or 5 pt), spaces of 40 mm² and 4.5 mm across or more.
• Bold and easy (adults): relaxing, big shapes, bold lines, markers welcome (3 pt usual; 2.5, 3.5 or 4 pt), spaces of 25 mm² and 3.5 mm across or more.
• Detailed (adults): intricate, for pencils and gel pens (1.25 pt usual; 1, 1.5 or 2 pt), spaces of 4 mm² and 1.3 mm across or more.
• Seniors, large and clear: big clear spaces, strong lines, calm designs (4 pt usual; 3 or 5 pt), spaces of 40 mm² and 4.5 mm across or more. Changing it draws the designs again with the usual line weight of the new readers. Locked designs and pages you edited by hand stay as they are; AI and photo pages are made again from their saved pictures, at no cost.