I.R.I.S. Readiris 14 for Mac User Guide - Manual (Page 79)

Section 7: Editing the Recognition Zones
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Deleting zones
 Click the zone you want to delete.
 Or Cmd-click to select multiple zones.
The entire zone(s) are now marked in their corresponding color.
 Then press the Backspace button on your keyboard.
Deleting all zones
 On the Edit menu, click Delete All Zones.
Deleting small zones
 On the Edit menu, click Delete Small Zones.
All zones that are smaller than 50 pixels will be removed.
Manually drawing zones
 Click the Layout icon to display the Layout tool.
 Click the zone type you want to create. E.g. Text
 On the right side of the tool, set the option to Click and drag to
draw new Text zones.
 Then click and hold the mouse button and draw a frame around
the section to want to recognize as text.