Using AWS Load Balancer shows the IP of EC2 instance in the browser

Being very new to cloud deployment in general I am currently setting up my first load balanced environment with two EC2 instances (web servers) to allow drain stopping back and forth for continuous deployment.

I have the domain name registered and pointing at the load balancer but when I navigate to that domain in my browser the URL bar in the browser shows the end IP address of the EC2 instance as opposed to the domain that points to the load balancer. I realise this is simply a lack of understanding on my part but an explanation of how this should work would be great. I couldn't find anything in the AWS docs (which is strange because they are brilliant).