In version 4.3, when you click on the Start button in LibreLogo toolbar, the program runs a demo when you have a blank document.
I suggest to use also the same sample inside a DEMO command, which could also be typed inside the Librelogo textbox at any moment.
Also, the final turtle commands in the sample could be HOME and CLEARSCREEN, because the turtle retains both bad position and colors after running the sample.
In order for the "DEMO" command to work, the command would have to be overwritten with the sample code.
I think HOME as the last line and CLEARSCREEN as the first line is good, so if the user keeps pressing the start button, it will replicate the same way.
One thing i noticed when play with Logo is that if you press the 'HOME' button it resets the turtle's position and also turns it to its default green, but using the 'HOME' command at the end of the sample doesnt turn the turtle back to green. Think the HOME button could also have a HOME type icon like in a browser, or else change its tooltip to Reset or Rewind. :)