Tabs and windows
Gestures
Swipe back and forward, and keep swiping to pick any page from your history.
This page is a first draft. It may change before the public beta.
Swipe back one page, then keep pushing and hold: the arrow turns into a wheel of page titles. Move up to an earlier page and let go.
Back and forward
Swipe horizontally with two fingers on a page. A glass arrow follows your fingers; let go past the line and Arx goes back or forward one page. Let go early and nothing happens.
Your whole history
Push further and hold for a moment. The arrow turns into a wheel of page titles from your history. Move your fingers up or down to choose a page, with a tick of haptic feedback for each step, then let go to open it.
The Back and Forward buttons also show your history as a menu.
Between spaces
Swipe across the sidebar to move between spaces.
A Magic Mouse and three- or four-finger swipes keep Chromium's standard behavior.