Deleting system fonts.
Font Book did not automatically display System Fonts. The user guide did not include that they have to be active in instructions. Tried a sundry of methods to delete them, target disk mode, reinstalling Sonoma, and then some...
To remove system fonts:
Open Font Book / Settings / Sidebar / Activate “System Fonts” by checking box if not
Highlight System Fonts in sidebar
Return to Settings / Advanced / Reset Fonts
MacBook Pro M1, 16” 2021 / Sonoma 14.0
MacBook Pro 16″, macOS 14.0