More than likely, you will need to add you own tweaks to the adapter and (more often) the serializer. EDA provides blueprints to make this easy. For example, to make a customizable serializer for a User model:
ember generate drf-serializer user
This will create app/serializers/user.js for you to customize.
Similarly, if you wanted to, for example, extend the adapter on the application level:
ember generate drf-adapter application
This will create app/adapters/application.js for you to customize.