Sync Behaviour

In this page, we first and foremost specify the Synchronization Pattern as either Delta or Full File:

Delta

If the synchronization pattern is Delta, there is an additional field for an optional ActionTypeColumn field which lets you specify a column from the schema that provides instructions on whether the record is an UPDATE, DELETE or INSERT, doing so will bypass the reconciliation process using the specified instruction.
Note: In the XML, actionTypeColumn is a Source attribute.

Full File

When using the Full File synchronization pattern there are two distinct sections, the Sync Key or Sync Record Behaviour (New Record Behaviour, Dropped Record Behaviour, Changed Record Behaviour). Below is an example of how this looks in the UI: