Developers can easily apply monospaced styling using the .monospaced() modifier in SwiftUI, which automatically pulls a fixed-width variant from the current font family or falls back to a default monospaced font.
While iOS 13 introduced the system font , iOS 15.4 and related updates refined how these fonts are accessed and rendered:
System apps like Apple Mail allow users to view messages in fixed-width fonts to maintain the alignment of text intended for table-like structures. How to Download and Install Fixed-Width Fonts