See Red Triangle on Each Table for descriptions of most PDF preview right-click options. The following options are also available:
Add column divider
Creates a column divider at the selected point. Choose this option to create a new column in the data table (for example, if the columns weren’t auto-detected).
Remove column divider
Deletes the column border at the selected point.
Add row divider
Creates a row border at the selected point. Choose this option to create a new row in the data table.
Remove row divider
Deletes the column border at the selected point (for example, if the rows weren’t auto-detected).