To be able to enter absences in the calendar and in the schedule, you must create them first in the schedule settings.
You can access this area via
Settings > Schedule > Settings > Absences.
Common absences are, for example, "Vacation", "Vocational School", "Illness", "Days Off", "Further Training".
Create absences
Select + New Absence to create a new absence or click on an existing absence to edit it.
Description
Name of the absence (e.g. Vacation)
Abbreviation
The abbreviation is used in the
schedule exports and should consist of a few letters.
Example of abbreviations in the attendance export:

Counts as working time
Some absences like "Further Training" or "Trade Fair" count as working time and should be counted as such in your reports and statistics. Enter the working time in minutes here. Example: 8 hours correspond to a value of 480. Vacation days for part-time employees are calculated at 240 minutes.
Coloring
In the schedule, your absences have different colors, which you can set here.
Example of differently colored absences in the calendar:

Behavior when transferring working times
In the schedule, you can transfer an employee's working times forward over several months. Specify here whether this is a recurring working time that should be transferred. In the event of a schedule change, these will be overwritten as well. Suitable for "Vocational School", "Office Day".
If this option is disabled, this absence will not be transferred. If you enter it in the distant future, it will not be overwritten if you recreate the schedules. Suitable for "Vacation", "Further Training", "Illness".
For more information on schedule transfer, see here.
Count as Training
Counts this absence as training for the employee.
This absence can only be removed manually.
This absence is fixed and can only be manually removed from the schedule. This prevents overwriting by schedule transfer.
Upon entry, retain already entered working times.
Absences automatically remove the working times, breaks and events of the day. However, with this setting you can define that an absence does not do this.
The use cases for this are very specific: If you use certain absences as markers for days that should be visible in the calendar, for example, but have no impact on the schedule, this could be useful for you.

Use absence in the schedule
In the schedule, you can enter absences for the desired days, which are then visible in the calendar and, according to your settings, are counted or not counted as working time in the reports.

Enter absence in the calendar
Click on the desired employee and select "Change Working Times". Then select the desired absence.

Enter vacation for multiple days

View absences in the employee file
In each employee file, you can view all absences entered so far for the employee under the Absences menu item.

Learn how to enter a half-day vacation in the calendar
here.