Let Users Set Out-of-Office Messages in Chatter

Let your users schedule and customize an out-of-office message, and place it next to their name in Chatter. You can enable or disable this feature in Setup, under Chatter Settings. Setting an out-of-office message is available only in Lightning Experience.

Out of Office Setting
  1. In Setup, go to Chatter Settings.
  2. Click Edit.
  3. In the Out of Office section, enable (or disable) Users can set Out of Office messages.
  4. Click Save.