How Mac keyboard opens F1-f12 function key

First click on the Apple icon in the upper left corner of the system desktop to find System Preferences, and click to open the System Preferences panel, as shown in the picture.

In the "Hardware" in the Open System Preferences panel, locate the keyboard and click it.

In the Open Keyboard panel, locate the keyboard, which has both keyboard and keyboard shortcuts, as shown in the figure.

In the keyboard option, find the F1, F2, and other keys as standard function keys, and select the previous tick, as shown in the figure.

Generally do not save, check the system has been the default is saved, if you are afraid not to save, you can click on the above "show all" back to all the page to save.

How to turn on the F1-F12 function key setting on the MAC keyboard is complete.