This screeshot shows Untitiled - Data Set page. There is a dataflow with three icons: demo, filter and upload.  Under the dataflow, there is a Name textbox and Add, Cancel button. 
The center body of the page displays the default database and the tables residing in it. It has five citi bike tables: bike_trips, bike_trips_objective, bike_trips_parquet, bike_trips_small, bike_trips_weather_parquet. The left side of the pageshows the bike_trips_weather_parquet table data and the right side shows all the columns selected. Add All is being clicked.