how to find train connection?

Hi, You would find your connecting train the way you would find your connecting flight at an airport. Know the train # for your next/connecting train. Then look up the train number that should be displayed on the boards at the train station. This will give you the track number.

https://www.seat61.com/train-travel-in-france.htm

There will be information screens with the name/number of your next train, departure time, and platform number. Bergerac only has 2 platforms. The other has 4. The information should also be on the SNCF app, before you arrive.

What is your travel date and time?
There are monitors on the platform that will tell you which Track (Voie) your connection is at. For what I can see, at least at Libourne the Tracks are lettered, Voie A (which is station side) and Voie B, Voie C, and Voie D, located on island platforms, so you may have to go down a stairway to the under-passage, then up to your new Track.
Wondering why you don't take one of the direct trains from Sarlat to Bordeaux.

If you download the SNCF app and buy via the app, it tells you what track to go to.

Hi deborawkart,
I take this train often but am surprised that there is a connection as it is one train from Bordeaux to Sarlat. Make sure that your scheduled time hasn't switched from Train to Bus (as there are works happening through out the fall, many of the mid-day trains are now buses.) All the train stations are quite small so 10 mins is just fine. What I think may be happening with your ticket is that it's a TRAIN Sarlat to Bergerac, BUS from Bergerac to Libourne, the TRAIN from Libourne to Bordeaux.