There is no currently no way to do this within Miro itself, but seeing as Presenter Notes is still a beta feature at the time of this post, perhaps this is already on Miro’s list of future enhancements.
However, to request this as a feature, I will move your post to the Wish List idea forum for upvoting by others.
I did not that, when I have the Presenter Notes window open in Chrome, I can zoom in by using Ctrl/Cmd+mouse wheel (or Ctrl/Cmd+/-) to zoom in out to adjust the font size and this does not appear to impact the other/Miro board window.
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