Blank Option in Select Column for Highlight List

Why there is a blank option in the Select Column for Highlight list

If you don't enter a name for a column in the Column Label field, there will be no option displayed in the Select Column for Highlight list in the dynamic table. For example, Let's say you have a dynamic table with 3 columns, and you only name the second column (in the following example, the second column is named "Test").

Click on the dynamic table to open the dynamic table's input slider, then expand Row Highlighting. You'll notice that the Select Column for Highlight list displays a blank for each column without a label.