When exploring text styles or working with type in general you will probably change its’ line height, letter spacing etc. to find a style that fits your needs. This can result in a messed up textbox.
But what if i want to have a textbox with the standard values of a given type? Thats where I need an option to “Reset” the type to its original values. At the moment, even when creating a new textbox, Figma will use the last settings that have been used.