Macdefaultfont

SystemfontsuptoMacOSX10.7edit;HelveticaNeue,sans,book,CondensedBold,CondensedBlack,Ultra-light,Ultra-lightItalic,Light,LightItalic, ...,SFProisthesystemfontinmacOS.NYisavailableforMacappsbuiltwithMacCatalyst.macOSdoesn'tsupportDynamicType.Whennecessary,usedynamicsystem ...,ClicktheFontpop-upmenuandchooseafont.ClickthearrowsnexttoFontSizetochooseafontsize,ortypeavalueinthetextfield.ClickOK.Afte...

參考資訊如下
List of typefaces included with macOS

System fonts up to Mac OS X 10.7 edit ; Helvetica Neue, sans, book, Condensed Bold, Condensed Black, Ultra-light, Ultra-light Italic, Light, Light Italic, ...

Typography

SF Pro is the system font in macOS. NY is available for Mac apps built with Mac Catalyst. macOS doesn't support Dynamic Type. When necessary, use dynamic system ...

Set a default font in Pages on Mac

Click the Font pop-up menu and choose a font. Click the arrows next to Font Size to choose a font size, or type a value in the text field. Click OK. After you ...

Fonts

SF Pro. This neutral, flexible, sans-serif typeface is the system font for iOS, iPadOS, macOS and tvOS. SF Pro features nine weights, ...

Notes - What is the system default font?

Fonts on Macintosh

The primary system font in OS X El Capitan and above is San Francisco. OS X Yosemite used Helvetica Neue, and preceding versions largely employed Lucida Grande.