How turn off some function...?

Excuse me for my newbie question: how I can turn off the merged guide points marked with red arrows in my screenshot. Is this the result of some plugin or a regular feature? Thank you.

This are TrueType outlines. You can convert them to postscript by clicking Path > Other > convert to postscript (or Cubic) (not at my Mac right now)

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Thank you very much! )