which is the fn key on a mac
Fn key Apple also place the Fn key at the bottom left of the keyboard, displacing and shrinking the left Control key, though this is less controversial as macOS, the main operating system for most Apple laptops, is much less reliant on the Control key for shortcuts and modifiers than Windows or Unix-like operating systems.
MacBook Pro The fourth generation MacBook Pro was announced on October 27, 2016. It replaces the function keys with an interactive, multi-touch "Touch Bar" and a Touch ID sensor integrated into the Power button.