Marvin 1.61.0 introduced a new Note editor, supporting markdown. The new editor has lots of new features, like:
h1, h2, and h3 headings with padding
inline controls for editing styles (when text is selected)
a "+" button you can click to add new items
human-readable standard export format (markdown)
Your old notes will be upgraded to the new format as soon as you edit them.
But: not all the old features made it, due to lack of support in markdown. Sorry for the inconvenience!
fine-grained font size control
tab to indent