1. in config.js under views add

className: "remove_empty_slot",

2. add the following css to custom.css

/* CalExt2 - Hide empty days on agenda */
.CX2 .remove_empty_slot .eventCount_0 {
        display:none;
}

https://github.com/eouia/MMM-CalendarExt2/blob/master/doc/Configuration/View.md

dateFormat	Object	{...}	{...}	See Event Time.
timeFormat	Object	{...}	{...}	See Event Time.
dateTimeFormat	Object	{...}	{...}	See Event Time.
relativeFormat	Object	{...}	{...}	See Event Time.

Do You know, if my questions in the Post before, are makeable?

Now i have some other questions.

1. Is it possible to Change the timeformat from a date?
   From “16:00 Test” to “16 Test”.

2. Is it possible to delete time from special entrys?
   From “14:00 work” to “work”?

Edit: I was to fast. It only worked a few minutes.
Now, i can do what i want, it dosnt show this calendar.

I would open an issue on the github site for the module

so, that means the ext2 is having a problem…

when did u clone ext2? there was a problem when the api returned the cal data in zipped format…
he fixed that last week I think…

so, if u have not updated recently do

cd ~/MagicMirror/modules/MMM-CalendarExt2
git pull

and restart the mirror app

How i say… The Main Google calendars work fine with the same settings.

is this cal listed first?

there is a total number of entries… so it will truncate
and there is also how far forward is shown

  maxItems: 100,
  beforeDays: 60,
  afterDays: 365,

which view are your using?