Operating the mouse wheel while hovering over an empty part of the canvas, e.g. no canvas element is highlighted at the current cursor position, will zoom the canvas towards/away from the current mouse cursor position.

    Zooming in/zooming out is also possible by clicking on images/download/thumbnails/20423473/zoom_in.png and images/download/thumbnails/20423473/zoom_out.png buttons at the bottom right of the canvas view.

    Clicking on the Zoom to fit images/download/thumbnails/20423473/zoom_to_fit.png button at the bottom right of the Canvas will switch between a magnification, which displays the entire molecule in your current viewport and the previous zoom level.