SetSubtitle(subtitle$)
subtitle$. The subtitle is shown in the action bar
below the display's title, which can be set using SetTitle().
To remove the subtitle, pass an empty string in subtitle$. By default, there is no
subtitle at all.
Alternatively, you can also set the subtitle in the @DISPLAY preprocessor command or when creating the display using CreateDisplay().
SetSubtitle("Written by Andreas Falkenhahn")
The above code changes the subtitle to "Written by Andreas Falkenhahn".