In the latest preview release of Data Sync we have updated the Connection Dialog window to make it easier to locate providers and access the connection library.
As Data Sync gets more and more providers it was becoming difficult to find the provider in the list. We now group the providers by type in a Tree list which makes it much easier. Also since this was a re-write of some old code it's now faster too.
Additionally you can now Quick Connect without creating a Library connection by selecting Connect.
Lastly connecting via the Connection Library also updates the Library *.dsconn file so this is easier to update credentials by simply updating a Library connection and connecting.