Set Fonts Menu

This menu allows you to choose the font for the
theorems or the lemmas, etc... The same for the fonts
of the sections, subsections, etc... and for the title, authors,  etc...
You click for instance on proposition then the
fonts menu appears and you choose a font, then the shapes menu appears and you choose a shape, then all the propositions change to this font and this shape. If you save the document then this font and shape are kept for this document.