Context menu in the header

Make the following settings in the context menu of the header of the editing area:

Duplicate Column	Duplicated the column under the cursor.
Duplicate Selected Columns	Duplicates the selected column.
Insert Empty Column to the Left	Adds an empty row at the left of the clicked column.
Insert Empty Column to the Right	Adds an empty row at the right of the clicked column.
Delete Column	Deletes the column at the cursor position.
Delete Selected Columns	Deletes all the selected columns.