In the "Configure Dataset" step when uploading or configuring a new dataset, you'll see the configuration panel where you can make selections for columns and data types.
Within the configuration panel, you'll notice two arrow buttons, located in the middle of the configuration panel. These arrow buttons allow you to control the relative sizes of the configuration panel and the columns control.
Clicking the up-facing arrow button will expand the columns configuration panel. This is particularly useful when you want to focus on the column selections and data types, or view more columns simultaneously without scrolling.
Clicking the down-facing arrow button will expand the general dataset configuration controls. This is helpful if you want to focus on a custom SQL query or flat file configurations such as tab patterns and skipping rows.