Pack n play question

Ok- this may be a dumb question, but I want to make sure I know how to use a pack n play.

We have the one with a bassinet, bouncer, and changing table.

Am I correct that the bassinet feature is actually just the bottom raised higher?

Assuming so, do you keep the changing table part on there when baby is sleeping or take it off and on?

I believe the bouncer must be off to use the bottom.

Insight? :)