A print document can be saved by choosing one of 'Save' or 'Save As' from the file menu. 'Save As' will prompt for a file name before saving.
The .pprint file will contain a copy of the images used. This file can therefore become very large.
To load a file, choose 'Open' from the file menu. This will discard the current document and load the new one.
Recent files are listed in a 'Most Recently Used' list at the bottom of the file menu.