The Track Changes Default toggles in Application Settings control the behavior of Track Changes, allowing you to select whether or not track changes is on by default when sending Collaboration Room invitations and checking out or sharing documents.
Go to Settings>Application Settings and select the Application Options tab.
Go to the Track Changes Default section.
Adjust the settings as desired.
Collaboration Room. Setting this toggle to the ON position will default the Track Changes setting to ON when creating Collaboration Rooms. However, you are able to override this setting when creating an individual Collaboration Room
Document Checkout / Share. Setting this toggle to the ON position will default the Track Changes setting to ON when checking out or sharing documents. However, you are able to override this setting when checking out or sharing a specific document.
When you make changes, click 
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NOTE: The Collaboration Rooms are a feature available in accounts which have paid for them.