Many of you have asked and now you’ve got it: a way to mark your profile with out-of-office information. The message displays next to your profile picture and next to your name in feeds and when you’re @mentioned. This change applies to Lightning Experience only.
Setting it up is a snap. The Out of Office setting button is at the upper right corner on your profile. You can check Set Out-of-Office message, choose your dates, customize your message as needed, and save.