Origin's project file can mix different characters like text, sybmol and arrows, and different languages like English and Asian words. You may find it useful to globally control their default fonts respectively. The Special Default Font dialog is introduced for this purpose. Once you set a default font for a kind of characters, such as Greek sybmols, all Greeks in different places (Graph, Notes, Worksheet, etc.) will be updated accordingly.
Note: As listed in the above table, this dialog is used primanly in Symbol Map or as Escape code for mixed fonts. If you want to set default font in Toolbar, please use Prefercen: Options dialog > Text Font tab.
Suppose we compose a short paragraph mixed with Chinese and English. We can specify the font of English characters by
See how the displays determined by the font specified in the Special Default Fonts dialog: