The great thing about your Cowriter is that it's aware of all of your other articles, which means it's in the perfect position to create internal links when there is naturally an opportunity.
The Cowriter will typically look for the following criteria:
The articles must be similar or at least loosely related
The anchor must be organic and make sense to link to
The article must be active and not archived
While enabled by default, you can toggle this feature in the Cowriter menu.