flutter-quill/doc/configurations/font_size.md

🔠 Font Size

Within the editor toolbar, a drop-down with font-sizing capabilities is available. This can be enabled or disabled with showFontSize.

When enabled, the default font-size values can be modified via optional fontSizeValues. Accepts a Map<String, String> consisting of a String title for the font size and a String value for the font size. Example:

fontSizeValues: const {'Small': '8', 'Medium': '24.5', 'Large': '46'}

Font size can be cleared with a value of 0, for example:

fontSizeValues: const {'Small': '8', 'Medium': '24.5', 'Large': '46', 'Clear': '0'}