Use the Keyboard pane of Keyboard System Preferences to set options for keyboard and function keys and for keyboard brightness. If your Mac has a Touch Bar, you can set 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. For more information, see Set how quickly a key repeats.
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 with Control Strip, Expanded Control Strip, App Controls, or F1, F2, etc. Keys.
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, or Show F1, F2, etc. Keys.
The choices available depend on the setting of the “Touch Bar shows” option.
Note: You can always show function keys (F1, F2, etc.) 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
Use all F1, F2, etc. keys as standard function keys
Use the keyboard function keys for keyboard shortcuts without pressing the Fn keyboard key.
Customize Control Strip
Change which buttons are shown in the Control Strip. You can also customize the Control Strip directly in apps.
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 your Mac.