If you've already drawn a Line/Curve Table in the drawing, the block would need to be redefined in order to allow the change to take place. To do this, first erase the line or curve tables from the drawing and then go to Annotate>Line/Curve Table>Table Defaults and select the "Set Line Table Labels" button. Change the width on one of the columns slightly and hit OK and then OK again to close the Table Defaults dialog. You should at that point see the blocks redefine. You can now recreate the table and it should reflect the new settings.
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