And, if the VPN is ticked off in settings will all traffic still go through?
There are two basic types of VPN, a split tunnel, and tunnel all.
the split tunnel sends only VPN related traffic across the VPN, while the rest of your internet traffic and activity route out the local gateway
the tunnel all mode sends all traffic through the VPN, so you would effectively be browsing the internet via the remote VPN connection, nothing would route out your local gateway.
The send all traffic is basically setting this to tunnel all mode.
Alright. So if I tick it off on iOS settings does it mean all traffic stops going through the vpn?
No, it just uses the split tunnel settings as noted in my first reply.