You need to turn on/off Clutter in the Outlook Web App, not the Outlook Client, but it will save your changes across both platforms.
Sign in to the Outlook Web App at connect.parkland.edu/office365.
At the top left corner of the page, select the App launcher icon, and then select Mail.
On the top right corner of the page, click on Settings and at the bottom of the popup in the "My App Settings" section, select Mail.
Go to Mail > Automatic processing > and click on Clutter.
To enable Clutter, check the box that says, "Separate items identified as clutter". When you do this, the following text will appear and it will already be enabled: "Send me notifications about messages that are separated as Clutter." Click Save .
You disable Clutter anytime by unchecking the box next to "Separate items identified as Clutter".
Note: The Clutter folder remains in Outlook after you turn off the Clutter feature.
Find the Clutter folder
In Outlook 2016 for Mac, in the left pane under Inbox, click to open your Exchange account, and then click to open the Clutter folder.
Help Clutter learn your preferences faster
It might take Clutter a few days to fully adapt to your preferences, as the system tracks your choices and uses the information to identify similar messages in the future. But you can help Clutter learn your choices faster:
If you see a message that was sent to your Clutter folder by mistake, select the email and drag it to your Inbox or another folder in your Inbox.
If you see a low priority email in your Inbox, select and drag it to the Clutter folder.