1) Open the Outlook app.

2) In the top left-hand corner, tap your profile photo (avatar).

3) In the bottom left-hand corner, tap the settings cog (gear icon).

4) Tap the account that you wish to remove from your device.

5) At the bottom of the account window, tap Delete Account.

6) Tap Delete to confirm.

Outcome

The account has been removed from your Apple mobile device.