Is it possible to change default settings for things like font for labels in Print Composer? -TVZ
I suspect that most of what you are interested in would be best managed by creating and using templates. In that case, the settings for fonts of label boxes which have been inserted in the composer will be maintained. It is worth the investment to understand templates, as they allow you to create consistent maps between projects.
In a template, if a new label is added/created it will still have the default font.
As far as I know!