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Writing Focus Mode

Writing Focus Mode dims everything except what you're writing. It's fun, and many writing apps have it now. I'm afraid to say that I always find it a bit more distracting than not!
To turn on Writing Focus Mode
- View > Writing Focus Mode (Option-Command-F)
To choose what stays bright
- WriteRoom > Settings > General > Writing focus unit: Word, Sentence, Visual Line, or Paragraph
Sentence is the default.
TIP
Writing Focus Mode isn't saved. It's off each time you launch WriteRoom.