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Email Setup (Classic Outlook)
- Go to File > Option > Calendar > Calendar options.
- Check the Shorten appointments and meetings check-box.
- In the drop-down menu, select End early or Start late.

- Once those selections are made, use the drop-down to set how early the meeting will start or how early the meeting will end.
- Click Ok after your selection.
Email Setup (New Outlook)
- Go to Settings > Calendar > Events and invitations.
- Check the Shorten duration for all events check-box.
- In the drop-down menu, select End events early or Start events late.

Note: Once these settings are made, they will be used across all the Outlook platforms.