We can change appearance, like font, font size and theme, with Tools/Global Options. Obviously, these are global settings. What if I wanted to change appearance on a per project basis. E.g for one project, I have large font and dark background, and for another, I have smaller font and light background.
Why I would like this is because, using the same machine, I will do RStudio screencasts, and normal data analysis work, and teaching in a class room (where display is projected). I am constantly changing my global settings as I switch between these contexts.