Use the Touch Bar on Mac
If your Mac has a Touch Bar, you can use familiar gestures — like tap, swipe or slide — directly on the Touch Bar to adjust settings, use Siri, access function keys and do tasks in different apps.
Control Strip
The Control Strip, located at the right end of the Touch Bar, lets you ask Siri or easily adjust common settings — just tap the buttons or, for settings like brightness and volume, quickly swipe left or right on the buttons. You can also expand the Control Strip to access more buttons.
Expand the Control Strip: Tap
, or press and hold the Fn key on the keyboard (if you set that key to show or expand the Control Strip in Keyboard preferences).Use Control Strip buttons: Tap the buttons to adjust settings, use Mission Control or Launchpad, or control video or music playback. For some settings — such as display brightness — you can touch and hold the button to change the setting.
Collapse the Control Strip: Tap
.
App buttons
Other buttons in the Touch Bar vary depending on the app you’re using or the task you’re doing. Each app is different — try out the Touch Bar to see what you can do.
For example, here are the buttons available to tap in the Touch Bar when you select a file in the Finder:
And here are the buttons when you view a picture in the Photos app:
You can use the Touch Bar to quickly add emoji to your text in some apps. Just tap 
, swipe to scroll through the emoji (organised by category, such as Frequently Used or Smileys & People), then tap the one you want to use.
Tip: In some apps, you can customise the Touch Bar to add buttons for the tasks you do most often.
Typing suggestions
When you’re typing text on your Mac, the Touch Bar can show words or phrases you might want to use next (called typing suggestions), to help you save time.
Show typing suggestions: Tap
.
Use typing suggestions: Tap a word, phrase or emoji. Spelling corrections are shown in blue.
Hide typing suggestions: Tap
in the Touch Bar.
If you don’t see in the Touch Bar, choose View > Customise Touch Bar, then select “Show typing suggestions”. Or choose Apple menu 
> System Preferences, click Keyboard, click Text, then select “Touch Bar typing suggestions”.
Colours
In apps where you can change the colour of text or objects, you can use the Touch Bar to select a colour, shade or mode (such as RGB or HSB).
Select a colour: Touch and hold
, then slide your finger to a colour.
Select a shade: Tap
, touch and hold a colour, then slide your finger to a shade.Select a mode or custom colour: Tap
, tap the colour list on the left, then tap a colour mode, such as RGB. To use a custom colour you saved, tap Swatches.
Use the sliders for a mode to change values, such as hue or saturation. To save your changes to Swatches, tap the colour (a + appears), then tap it again (a tick appears).
Hide colours or the colour values: Tap
in the Touch Bar.
Function keys
Many macOS keyboard shortcuts use function keys (F1 to F12). For example, you can use F11 to show the desktop.
Press and hold the Fn key on the keyboard to show the function keys in the Touch Bar.
Make sure you customise the Touch Bar in Keyboard preferences so the Fn key shows function keys.
Tap a function key.
If a keyboard shortcut includes a modifier, such as Option or Command, press and hold the Fn key with the modifier key. For example, to use Control-F3 to move to the Dock, press and hold the Fn and Control keys together, then tap F3 in the Touch Bar.
See the Apple Support article How to use function keys on MacBook Pro with Touch Bar.