I see a friends Windows 10 and many things are very different than the way mine looks. Why is it like this?
Well there may be many options But I would look at the Setting, Personalize section. There are many options to tune the way Windows looks and the way if operates.
I suggest you go to the Start menu, Settings, and the Personalize and review each section. You can then turn options on and off and evaluate the way things change. Remember what changes you make so you can always change things back later if you find out you liked it better before.
I change too many things one time and I forgot what I changed and still haven't found the correct item to put back. :(