Under Preferences > Fonts and Colours a whole range of fonts and backgrounds can be set by default. But I don’t see a possibility to choose a default letter for footnotes and annotations. As far as type and size of the letter is concerned, this is perfectly understandable: they are simply identical to the type and the size of the main text. But I would like to see an option to choose at least a default colour for letters (and backgrounds) of footnotes and annotations, which would help to distinguish them visually from the main text. Presently, it is possible to mark footnotes and annotations with any desired colour, but not in a predefined way. Or am I missing something?
Footnotes are always just a grey background - you cannot change the colour. Annotations are by default red but can be changed using the colour picker. Once you’ve changed it, new annotations will be created in the selected colour for the rest of the session (within that text view - the other view will revert to red until changed). To be honest, I don’t really see any need to have a Preference for this, as I really think that would be overkill. There cannot be a preference for everything, or the Preferences would be as big as Scrivener itself. 
Red is kind of a standard for making notes in text, and it really is easily changed.
All the best,
Keith
But wouldn’t it be an idea then to apply to footnotes exactly the same mechanism that is applied to annotations: different colour by default, with the possibility to change that colour in a predefined way for the rest of the seesion? Why a different colour by default for annotations, and not for footnotes?
I don’t see any sense in having different colours for footnotes. What would they mean? Footnotes are just footnotes… They are exported as footnotes, one after the other. Annotations, however, are notes to yourself about whatever, and you may want to change their colours to mean different things - red for editing notes, green for general notes, whatever. Annotations are the equivalent of taking different coloured editing pens and scrawling over your work. But footnotes… are just footnotes. They may have similar visual representations but they are semantically quite different.
All the best,
Keith
Thanks Keith, I can see your point!