Prune: click a branch, or drag across branches. Zoom: scroll or pinch. Pan: right-drag or Space+drag.
Desk Bonsai
It grows in real time, even while the app is closed. Keep water and nutrients inside the green sweet spots; soil that stays waterlogged rots the roots. Prune a little at a time: cutting too much at once shocks the tree. If it gets crowded, trim it or repot it.