It may just be a spacing issue.
If you can save as an epub it’s easier for readers to upload to IBooks and adjust fonts etc.
Several fonts are commonly recognized for their readability across various contexts. Serif fonts like Minion Pro and Merriweather are praised for their resemblance to handwriting, which can enhance readability Sans-serif fonts, such as Roboto, Helvetica, and Arial, are often preferred for digital displays due to their cleaner appearance and ease of reading on screens
Lexend is another font that s… https://search.brave.com/search?q=easiest+fints+to+read&source=ios&summary=1&conversation=9d016251cdc90a5827e6f6
