1) In Salesforce, go to the "SalesWings Setup" tab
2) Click on "Resume"; or "Stop" and then "Resume"
3) Click on "Run" next to Synchronize all SalesWings data. It might take a while before the full dataset is fetched and the setup page updates the last sync time.
4) Refresh the page and ensure that it says that a full sync has been scheduled. If not, refresh and click on again on Run (like in step 3).
Once the "Full Sync Scheduled" has disappeared it means that the full sync has started. And depending on the data volume, it could take an hour or more for the SalesWings data to appear on your standards objects.