I usually work with an external ThinkPad keyboard, which matches the configuration of my laptop’s. Lately, though, I’ve been using my laptop’s keyboard more and more. At some point, Lenovo decided to design the 6th keyboard row in a slimmer way and switched the standard F1-F12 keys to function keys (volume, brightness, etc). This is very inconvenient if your work involves typing a lot, as editors tend to offer handy shortcuts with the F1-F12 keys.
This is how you change the default configuration:
FN + ESC.