Hi MWPRUES and
Sorry, but, the Fitness and Nutrition Trackers run Sunday through Saturday for everyone. There is not currently a way to change that. Hopefully, once you get used to that routine, you will come to like it.
Note that you can run the various reports for whatever dates you like. Not sure if that will help; but, I wanted to mention it in case it does.
Best wishes on your journey! Keep up with the good fitness!