Unfortunately there's not an easy way to get back to your table. Make sure to take note of the table name you're playing at as a reference and then look for that name in the lobby. You could also look through your past activity for ring games under "Activity" in the profile menu. You won't be able to join the table there, but you will be able to take note of the table name and find it in the lobby.
If you are disconnected during a tournament and want to get back to your table, you can keep track of all the tournaments you're currently registered in under "My Games and Tournaments" on the right side of the Dashboard.