@sdetweil , yes indeed.
After making a little bit of progress now I’m not able to understand why the module doosn’t do what I expect…
I try to change the icons as well as the color of the calendar events.
Icon works fine, color for icon as well but the “event” itself doesn’t change color.

I’ve figured out that the searchword is found - because it triggers the icon color as well as the icon color (regardless that the current searchword contains an German “Umlaut” (‘ü’).

I found a code snippet here and modified it to my requirements.

ev.color is the attribute I’ve used - this seems the right one.
But It only changes the icon color…

		{
		  module: "MMM-CalendarExt3Agenda",
		  position: "top_left", 
		  //header: "Wichtige Termine",
		  config: {
			  
			        eventTransformer: (ev) => {
			            const customEvents = [
			              { keyword: "Gelber Sack", symbol: ["fa-solid fa-arrows-spin"], color: "yellow" },
			              { keyword: "Restmüll", symbol: ["fa-regular fa-trash-can"], color: "green" },
			              { keyword: "Biomüll", symbol: ["fa-regular fa-trash-can"], color: "brown" },
			              { keyword: "Papier", symbol: ["fa-solid fa-dumbbell"], color: "blue" },
			              { keyword: "Urlaub", symbol: ["fa-solid fa-dumbbell"], color: "cyan" },
			            ]
			            const found = customEvents.find((condition) => {
			              return ev.title.search(condition.keyword) !== -1
			            })
			            if (found) {
			                ev.icon = [ found.symbol ]
			                ev.color = found.color
			            }
			            if (ev.title.search('Restmüll') !== -1) {
			              ev.symbol = [ "fa-solid fa-cake-candles" ]
			            }
			            if (ev.title.search('Papier') !== -1) {
			              ev.symbol = [ "fa-regular fa-trash-can" ]
			            }
			            if (ev.title.search('Gelber Sack') !== -1) {
			              ev.symbol = [ "fa-solid fa-arrows-spin" ]
			            }
			            if (ev.title.search('Biomüll') !== -1) {
			              ev.symbol = [ "fa-regular fa-trash-can" ]
			            }
			            if (ev.title.search('Geb.') !== -1) {
			              ev.title = ev.title.replace('Geb.', '')
			              ev.symbol = [ "fa-solid fa-cake-candles" ]
			            }
			            return ev
			        },



					// useWeather: false ,
					showMiniMonthCalendar: false,
					//onlyEventDays: 10  -- Nur Tage mit terminen anzeigen ist in der custom.css eingetragen, DAS funktioniert...
		  
		  } 

		},

Where is my error now?

:-)

TIA for any hint.
Regards,
Ralf

.Dear Sam, @sdetweil ,

shame on me!
This is dumb.
thanks a lot for this hint.

If you are doing it right - it works …

I’m terribly embarrassed.
Regards,
Ralf

Dear @sdetweil ,
yes for sure, sorry…
It’s VERY basic, because my trials were ignored I doesn’t spent too much time on it yet…
As you can see I’ve disabled the not working parts (currently except the asked one - “onlyEventDays”.

// Kalenderübersicht (Agendaview)

		{
		  module: "MMM-CalendarExt3Agenda",
		  position: "top_left", 
		  header: "Wichtige Termine",
		  // useWeather: false ,
		  // showMiniMonthCalendar: false,
		  onlyEventDays: 1

		},

Thanks for your prompt reply - I was tired yesterday night, so seen your query rigth now.
Warmest regards,
Ralf

Dear gurus,
I’m pretty new here and i do have the exact same problem as the original thread owner.
I’ve identified and tried the conig.cs approach with “onlyEventDays: 5,” but this doesn’t work for me unfortunately.
In addition other documented switches of this module
// useWeather: false ,
// showMiniMonthCalendar: false,
don’t work either for me.
Any idea?
Because of the other two switches I don’t want to play with CSS right now…
Thanks for any hint/advise!

Warmest regards,
Ralf