What is Touch Bar? It was installed from MacBook Pro (Late 2016) From macOS Sierra 10.2.2, you can take screenshots of the Touch Bar using keyboard shortcuts (shortcut keys) or the app “Grab”.

shortcut key

Hold command + shift and press 6 If you press the shortcut key “command + shift + 6”

App “Grab”

See here for how to use and set up the Touch Bar/Touch ID.

How to use and set up Touch Bar/Touch ID