Epson Expression 1680 Reference Manual page 52

To select several marquees at once, click each marquee while
holding down the Ctrl key (for Windows) or the Shift key (for
Macintosh) on your keyboard. The frames around selected
marquees become static dotted lines, and the last marquee you
click becomes the active marquee. To cancel the selection of a
marquee, click it again while holding down the Ctrl key
(Windows) or the Shift key (Macintosh).
Resizing marquees
When you move the cross-hairs over the edge of the active
marquee, the cross-hairs will change to a double-headed arrow
as shown below. (You may need to click the marquee first to make
it active). Drag the arrow to resize the marquee. To resize the
marquee proportionally, press the Shift key while dragging the
arrow.
Note:
You cannot resize an active marquee if any other marquees are selected.
To cancel the selection of a marquee, click the marquee while holding
down the Ctrl button (for Windows) or the Shift button (for Macintosh)
on your keyboard.
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Understanding EPSON TWAIN Pro Features