Define Sync Trace Level

Use this activity to set the sync trace level on the server for a single mobile app, user, or device. This helps troubleshoot synchronization issues. To do this, click the required app name to activate the action buttons. Then, select the Edit/Device Settings command. Next toggle Enable Traces to enable Sync Trace Level. You can select either Basic or Detailed options. You can access this feature from the Installed Apps Details page or the Installed Apps/Devices page. 

Refer to the technical documentation for further details:
Installed App Details

Prerequisites

System Effects

As a result of this activity, traces are written and visible on the Synchronization Traces page.