[Joche]

Please try if this is still the case when you remove %%equalbars 1
When you transpose a song, the content of the bars changes because of more or less accidentials. With a given overall width of the lines this might cause a different scaling.

Regarding font size of chords: maybe https://www.zubersoft.com/mobilesheets/f...13056.html helps?

Thanks itsme for your reply. I tried to remove %%equalbars 1 directive. Same probleme. I tried to transpose in C or Am with no accidentials, Same thing.

I tried to remove %%pagescale 1.2 directive or change directive. The issue come from this directive : 
In the key of the piece,%%pagescale 1.2 (or higher) directive is applied; in another key, the directive is null and void.