[OS X TeX] Clearing fatal error in log

[Mark Lim]

Hi
Is there a way to clear the fatal error in the log file?  Reason is due to
 handful of underfull horizontal box.
I am fix this by rephrase paragraph by paragraph.
This  prevents further previewing on TeXShop.
What's the best way to resolve this? I read about set draft . How to set
draft mode?
My math with tikz document class is a book.
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