How can I change the colour matching option in the Default Settings printer preset?
You can't change the Default Settings print preset, but if you make a new Preset, and print with it, then MacOS normally offers the same preset again, the next time you print.
In earlier versions of MacOS, if you held down Option when you pressed OK in the Print menu, the settings would be saved as the default, but that doesn't seem necessary now. You could try it if it isn't working.
You can change the defaults of the printer by accessing the CUPS web interface, but that doesn't always include ColorSync options.
The first time you try this, you need to enable the CUPS web interface. In Terminal, type cupsctl WebInterface=yes
In a web browser, go to http://localhost:631
Then you'll see the CUPS controls. Click on &quot;Printers&quot; in the bar along the top. Choose your printer from the List. and in the drop down list, select Set Default Options.