Thank you. It works as expected. I see the blocks add each item from the long list into a temporary list until it reaches the width parameter and then it adds those items to a new output list, repeating until all of the items in the original list have been parsed.
Now. I'm grappling with a way to save the list of lists externally using my original plan which was as a CSV (essentially a text file). But I feel this approach might not be appropriate anymore because saving my list of lists to a text string depreciates the list i.e. I can't simply write a string to a file in the "format" of a list and expect the system to interpret the string as a list when I load it back in.
I should probably be using something like a TinyDB to save the list of lists. I think @TIMAI2 's post here might give me what I need. I'll review and try to understand that to see how it goes and report back.