The default location for saved scenes can be changed by defining it in an auto.cfg configuration file.
Create a file named auto.cfg by using a text editor (Notepad will do the trick) and add the following line: scene.my_scenes_path = r"C:\My Scenes" (replace the path by your own). Next, place this file in ’ C:\ProgramData\Real Games\Factory IO '.
More information about the auto.cfg file and its contents can be found in the Console section of the manual.