Currently, you can choose between three font sizes for the appearance of notes:
S - M - L
These sizes correspond in pixels:
12px - 16px - 20px
While this gradation is basically arithmetically understandable (4 pixel distance between sizes), I don't think it's quite suitable in practice because for everyday use 12 pixels is actually too small and 20 pixels is too large.
It would be interesting to see what other users think about this, I personally would find 13 pixels for size S and 18 pixels for size L much more usable and closer to practice.
So, I suggest that:
S - M - L
should correspond in pixels:
13px - 16px - 18px
After all, the setting for the size of the text is not about compensating for large visual impairments - that can be solved much better at the device level - but rather about adjusting the appearance of text to personal taste or habit.
With the current gradation, I find the jumps from the base of 16px to smaller and larger font size a bit too strong.