AZW3 / KF8 also can have embedded fonts. Download for USB transfer to to get that instead of KFX.
You do have to go to Aa menu and select Publisher.
if the fonts are declared properly you'll get some sort of built-in monospace, even with mobi-KF7 format or azw3/KF8 without any embedded monospace.
KFX uses different rendering and more DRM. I'd not call it the best Amazon format.
Even big publishers often code / format ebooks badly, using inept people with very expensive packages, whereas free Calibre or Sigil from a properly formatted MS Word (or LO Writer via extra docx Save As) can produce a near perfect epub for upload to Amazon. Amazon then convert that to at least 3 formats and send the one they think is appropriate.
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