Question

Hello, honored Rabbi,
 
Rabbi Judah the Prince arranged the Mishnah.
I wanted to ask a few small details about that,
not for any important reason, just out of historical curiosity.
 
Does this mean that he arranged the collection of mishnahs in each tractate? Or did he only arrange the collection of texts, and only afterward was it divided into tractates, chapters, and mishnahs?
 
Did he determine the division into chapters, meaning decide that these ten mishnahs belong in the same chapter?
 
Did he also arrange the chapters in their order? Maybe his order of chapters was different?
 
Within each chapter, did he arrange the mishnahs in order? Maybe the order of the mishnahs within each chapter got mixed up?
 
And how do we know what Rabbi Judah the Prince did and what developed after him?