Change Keyboard preferences on Mac
On your Mac, use the Keyboard pane of Keyboard System Preferences to change options for keyboard and function keys and for keyboard brightness. If your Mac has a Touch Bar, you can change options for the behavior of the Touch Bar and the Fn keyboard key.
To open this pane, choose Apple menu 
> System Preferences, click Keyboard, then click Keyboard.
Key Repeat, Delay Until Repeat | How fast characters repeat when you press and hold certain keyboard keys, and how long to wait before repeating them. See Set how quickly a key repeats on Mac. | ||||||||||
Adjust keyboard brightness in low light | If your portable Mac has a backlit keyboard, have it automatically adjust the level of backlighting in low light conditions. | ||||||||||
Turn keyboard backlight off after [time period] of inactivity | If your portable Mac has a backlit keyboard, have it automatically turn backlighting off after your Mac is idle for the specified time period. | ||||||||||
Touch Bar shows | If your Mac has a Touch Bar, choose what is shown in it: App Controls; Expanded Control Strip; F1, F2, etc. Keys; or Quick Actions. | ||||||||||
Show Control Strip | If your Mac has a Touch Bar, choose whether or not to display the Control Strip when you choose App Controls or Quick Actions from the “Touch Bar shows” pop-up menu. | ||||||||||
Press Fn key to | If your Mac has a Touch Bar, choose what happens when you press the Fn key: Expand Control Strip; Show App Controls; Show Control Strip; Show F1, F2, etc. Keys; or Show Quick Actions. The choices available depend on the setting in the “Touch Bar shows” pop-up menu. Note: You can always show function keys (F1, F2, and so on) in the Touch Bar for specific apps. In Keyboard preferences, click Shortcuts, select Function Keys in the list on the left, then add the apps on the right. | ||||||||||
Show keyboard and emoji viewers in menu bar | Include the Show Emoji & Symbols menu | ||||||||||
Use F1, F2, etc. keys as standard function keys | Use the keyboard function keys for keyboard shortcuts without pressing the Fn keyboard key. | ||||||||||
Customize Touch Bar | Change which buttons are shown in the Control Strip portion of the Touch Bar. You can also customize the Control Strip directly in apps. | ||||||||||
Modifier Keys | Change the default behavior of the Caps Lock, Control, Option, and Command modifier keys. | ||||||||||
Set Up Bluetooth Keyboard | Use an Apple wireless keyboard, mouse, or trackpad with Mac. | ||||||||||
in the menu bar for easy access to You must enable Touch Bar extensions to make them available in the Touch Bar or from the Quick Actions button in the Touch Bar. See Change Extensions preferences.