When you change the style of note heads, whether it is for shape notes or solfege note-heads, you can now select if the style is applied on a fixed-do or a movable-do basis.
Fixed-Do
With the fixed-do, the color/shape used with a note will only depends on its pitch. A G will always be displayed with a So in Fixed-do.
Movable Do
With the movable-do, the color/shape used with a note will depend on the note pitch and the key signature's tonic. A G with a G major key signature will be displayed with a Do in movable do.
You will find this option at the bottom of the note style configuration page.
![](https://blog.flat.io/content/images/2020/09/fixed-do-movable-do-choice.png)
You can find all the information related to the styles of note heads on our dedicated help page.