The Column from marked functionality is a way to look up which column to assign to a column selector by fetching the cell value in a data table. The cell would then contain the name of the column you want to assign to a property in a visualization, such as what to use on the X-axis or what to color by.

Right-click the axis selector of the axis of interest and select Column from marked from the opened menu.

You use the Column from marked functionality when you want to update the visualization iteratively and quickly set another column for the property. Once Column from marked has been configured, pointing to a new cell by marking a row updates the property. If you only want to configure a visualization to use a certain column, you should not use the Column from marked functionality.

See Column from marked - examples for more information.