Just put your iPhone nearby Mac with their Wi-Fi turned on and TouchArch running on both devices.
It brings all the dynamic controls and full experience of Touch Bar to any Mac
Comparing with Touch Bar fixed on the top of keyboard, you can put TouchArch any place near your Mac
Select a palette and tap to choose a colour for text or objects in Pages, Keynote and more.
To use TouchArch, you'll need two things: 1) An iPhone running iOS 11.0 or later with Wi-Fi on 2) A Mac running macOS High Sierra with Wi-Fi on
TouchArch will show touch bar only when apps launch after TouchArch. Try to relaunch the app to make it work. If still not work, that means the app dose not yet support touch bar.
First, check Wi-Fi status on both Mac and iPhone. Next, try restart TouchArch on Mac and iPhone.
You can uninstall by deleting TouchArch.app from your Applications folder.