InDesign displays [registration], 100% of each ink colour, as a swatch in the swatches palette. It's impossible to remove the swatch.
Why is this? I have never had the need to actually use [registration] in my works, as far as I know it's only ever used to create printer's marks, and that's done by InDesign when exporting a
Lots of beginners are confused by the two instances of black in the palette, possibly ruining their work when using the incorrect one. So why is [registration] still there?