@Old_Death
I updated it to 1.4.4. Please update or reinstall the module.
I found a bug about twice applying the user event filter/transformer on the drawing miniMonth and agenda board.
However, that is not the real reason for your symptoms. You just made a mistake on your filtering. (You drop out “Natalia” events by filtering, so they were not able to be transformed.)

Anyway, here is my example.

eventFilter: (ev) => {
	return (ev.title.search('Test') > -1)
},
eventTransformer: (ev) => {
	ev.title = ev.title.replace('Test', '@')
	return ev
}

This code means

1. Filter out all other events except the event which has Test in the title.
2. Then transform Test to @.

You can see the result below;

ORIGINAL

CONFIGURED

@Old_Death
Sorry, there was a bug that filtering or transforming performs twice, I’ll fix it soon.

@Old_Death
You want;

1. Only events which have title “Natalia” would be shown, others should be filtered out.
2. Then the event (with title “Natalia”) should change its title. Right?

@Old_Death
It is contradiction. You can’t do both thing - drop the event or replace the title at same time. What is your purpose? (And filtering is executed primarily than transforming)

@jlward73
I updated CX3J to 1.0.1 to represent more detailed selectors. And by default, the border would be shown on today’s column.

@jlward73

Is there a way to isolate the entire day’s column?

It is not supported. Well, at least not in a simple, easy way. But I’ll add that in the next update soon.

canton means the top-left corner of the table. I’m not sure of the exact term in native English. :)
index means hour-index(left edged) of the table.
gridCell means the table’s rectangle grid (usually 30 minutes of the day).

@jlward73
Default hourLength is 4, so it seems your config is missing or mistyping that value.

@Sickdove
By the way, why do you consider Beaglebone Black? It is more expensive than RPI3B+ (at least in Germany now). Is there any benefit to that form factor?

@jlward73

/* config/config.js */

{
	module: "MMM-CalendarExt3Journal",
	position: "bottom_bar",
	config: {
		height: '50vh', // Half of the screen
		hourLength: 12, // Display 12 hours
		beginHour: 7, // From 7 o'clock
		staticWeek: true, // Since Monday
		days: 7, // For 7 days
	}
},