I looked closer.
You do need to install a Bionic Reading font. BUT ALSO the source text has to be converted to use it!
You can't enable it just with a font and suitable font support.
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Bionic Reading also offers a free converter tool for TXT, RTF, RTFD, EPUB, and DOCX files. That means you can convert eBooks and use Bionic Reading on your Kindle devices and other eReaders. Simply upload the file to the web converter.
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It's not just initial letters, but can be the initial part of a word.
See
https://www.howtogeek.com/807981/wha...do-you-use-it/
and
https://bionic-reading.com/
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At the time of writing, there's no evidence to suggest Bionic Reading is any better than regular text.
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In theory you don't actually need the Bionic Reading font at all. It's just icing, cosmetic.