MacOS High Sierra - Touch Bar Typing Suggestions
When you’re typing text, 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 > Customize Touch Bar, then select “Show typing suggestions.” Or choose Apple menu > System Preferences, click Keyboard, click Text, then select “Touch Bar typing suggestions.”