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If you would like to use mozaBook in a window rather than in the default fullscreen mode, first you have find the mozaBook icon on your desktop, right-click on it and select Properties.
In the Properties window, find the Target line, which usually contains "C:\Program Files (x86)\Mozaik\mozaBook\mozaBook.exe". Add a space to the end of that line, then write "-w".
Click on OK.
The next time you start mozaBook, it will open in a draggable window.