Pack n play

I originally wanted a pack n play where it has the changing station and bassinet next to each other but my grandma got this one for me so i dont think she understood. So this one is a reversible changer/bassinet. So would you use the bassinet part at night and then the other side where it's the blue padding as a changer? Or should I use the blue part for the baby to sleep in and then keep it on the changing station side? This is what my son will be sleeping in while he's in our room. So any tips/advice would be lovely!