hiddenOnStartup: "True",

and everything is fine… ;-)

with position commented out on the default calendar module, only it’s output does not display

//position:

Hiding worked really well. I could have figured it out myself. :-(

I’ll have to read up on the color again. But I noticed that CalendarExt3 and Ext3Agenda as well as other modules have a dependency on “calendar”. Can you tell me how I can keep the module in Config.js but not display it so that the dependencies remain?
Oh and sorry, with the color to Calendar I actually meant the colors of the calendar entries in your MMM modules Ext3.

Have a nice evening
Sven

2. Assign color into your calendar module config.

{
			module: "calendar",
			header: "US Holidays",
			position: "top_left",
			config: {
				calendars: [
					{
						color: "yellow",
						symbol: "calendar-check",
						url: "https://ics.calendarlabs.com/76/mm3137/US_Holidays.ics"
					}
				]
			}
		},