Hi Xinyi,
Nice to meet you! My name is Randy and I'm an independent advisor.
On a Mac, Office unfortunately doesn’t have the same "Customize Fonts" option that Windows does, which is why you’re only seeing the preset sets it’s more of a platform limitation than a bug. The workaround is to open the Slide Master in PowerPoint (or the template in Word/Excel) and manually set your preferred heading and body fonts, then save that file as a custom template so you can reuse it across projects. It’s a bit less direct than creating a font profile, but it achieves the same result, and saving it as a template means you won’t have to redo the font changes every time.
Kind regards,