Try Ctrl+Alt+4 (Cmd+Optn+4) or use the menu
Window >> Book
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Would you please Right click(Windows) or ctrl + click (Mac) on the black(empty) area before Library module and make sure Book module should be checked in the list Or press Ctrl+ Alt+4 (Windows) or Cmd +option=4 (Mac) to activate book module.
Thank you so much!!! It worked immediately and reappeared! Have a wonderful day!
Thank you!!! Have a wonderful day!