This article explains how to configure Microsoft Outlook so that emails are only Marked as Read, when the email has been specifically opened or you choose to Mark it as read.
Open the Microsoft Outlook App on your laptop and click Outlook from the Menu bar at the top then Preferences.
Select the Option 'Only when opened in a separate window'. This will require you to open an email in order to mark it as read.
Amend the Swipe gesture swipe left setting to Mark as read, this provides the option to use the swipe gesture on an Apple mouse or swiping left with two fingers on laptop track pad to the left will mark the email as read.
Close the window to save the setting.
Further information regarding multi touch gestures on a MacBook trackpad can be found here: https://support.apple.com/en-gb/HT204895