Is it limited to two windows?

I rember one of the older notes could have multiple windows open, but on my s6 its limited to two.

Car with limited Bluetooth.

In my Nissan Sentra 2012 it has Bluetooth, but for calls only. When I play music it plays from my phone instead of car, and in Bluetooth setting the car has call capabilities only. I have a rooted LG g2, and will be willing to try anything. Is there any tricks to make it think its a call but plays music instead.