It should be clear that this functionality only allows the user to pick a font style name to apply those settings to the selected items. There is no storage of this style name against those items, so you cannot change the look of items by just changing the configuration of the named font style.
Font styles are saved to file sa2001.ini in section NamedFontStyles.
Color information is in hexadecimal format in this sequence: BBGGRR for a full value; less digits mean that there was no B(for blue) or B+G(blue and green) values.
System Architect loads the style names in the sequence in which they are defined in the ini file.
A Named Style droplist appears to the right of the Font Style For... droplist. This presents the loaded styles:
This example denotes that font styling is for All Text, the named style is Heat Map Legend Header, and the font style is Arial.
A button to the right of it presents management options:
Record updates the current style name with the settings from the toolbar.
Copy To... copies the settings to a selected style name.
Add... records the settings against a new style name.
Delete... removes a style name. Style names provided by default are not allowed to be deleted.
Selecting a symbol selects the appropriate named style as controlled by the Font Style For... droplist.
Style names provided by default are constructed and rerecorded if they are missing, from stylesheet and default settings.