Touch Bar for Keynote on Mac
If your Mac has a Touch Bar, you can use familiar gestures — such as tap, swipe and slide — directly on the Touch Bar to edit and control presentations in Keynote. Controls on the Touch Bar change depending on what’s selected in your presentation.
For example, when you play a presentation, the Touch Bar shows all your slides along with other controls. If you’re presenting on a separate display, tap 
to switch the display showing the presentation.
If you’re working in the slide navigator, the Touch Bar shows controls to reorder, skip and group slides.
If a shape is selected, the Touch Bar shows controls to change the shape’s stroke (outline), colour fill, opacity and more.
Show controls for Keynote
If you can’t see the controls for editing text and performing other tasks in Keynote, turn them on in System Settings.
On your Mac, choose Apple menu
Click Touch Bar Settings, click the pop-up menu next to “Touch Bar shows”, then choose App Controls.
You can find more information about how to use the Touch Bar in the Mac User Guide.