1. Go to Configuration → Absence Types → Select the absence type → Edit. Then open Fields & visibility tab.
  2. The Reason field should be set up as optional or required.
  3. Visible to column allows deciding who will be able to see it on the Calendar.
  4. Save the changes.

Note:

Remember that this configuration is related to one absence type. You should repeat the above steps for each absence type if needed.

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