When dealing with larger designs, having the ratlines turned on can be a little hard to look at. When I try to turn off ratlines and route an unconnected net I no longer get the white helper line to show me the net I need to go to.
Here are some screenshots for reference.
Ratlines on:
Ratlines off:
Brand new interactions and interfaces. 
Easy to use and quick to get started. 
Because of you turn off all the ratline.
if you only want to turn off a part of ratlines please deselect the net at the design manager.