How do you make the fn keyboard button work like a Ctrl button? I'm used to having the Control button at the bottom left corner of the keyboard. It's a little annoying to be pressing Fn + Tab when I wanted a Control + Tab and the position of the Control button in the new Mac keyboard layout is just very uncomfortable for any finger to reach.

Does anybody know how you can make the Control and Fn buttons change function like how you can change the modifier keys in System Preferences?
Download and install Karabiner
Open Karabiner Elements and set the Target Device in the dropdown
Map fn to left_control and left_control to fn as below