In variable-width mode, each column of each row will be exactly as wide as required to display the amount of text. The title for "You've Certainly Got a Lovely Bunch of Coconuts" will be wider than the title for "Louie Louie." The rows in the text object will not line up directly underneath each other, unless all their text fields happen to be exactly the same length.
However, in variable-width columns mode, there will be a fixed amount of space between columns. If you specify 1.2 centimeters after the track number column, every row will have 1.2 centimeters of blank space between its track number and the field that follows it, no matter how wide individual track numbers may be. When you're in variable-width columns mode and you drag the column borders in the header bar, you're actually editing the width between the columns rather than the widths of the columns themselves.
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