TouchBar Gestures app switcher

I use the toucher gestures to activate the app switcher bar (⌘-tab)

and continuing to swipe right moves the focus to the next app on the switcher however I can't figure out a way to make swipe left move the focus to the left app in the reverse. I can set left swipe to Left key but that acts as if I keyed it down then up which assumes you the app one to left over and doesnt let me continue swiping as the switcher bar already disappears.

is this possible and I'm being dense?