To move an atom, drag it with the mouse in any of the selection modes.
To move a selection, press Space once or move the cursor toward the center until a blue rectangle appears, drag while holding the left mouse button.
To rotate a selection in 2D, press Space twice or move the cursor over the selection until a blue rotation symbol appears, drag while holding the left mouse button.
To rotate a selection in 3D, press Space three times or navigate to Edit > Transform > Rotate in 3D and choose from the options, drag while holding the left mouse button.
There are several ways to zoom in and zoom out. These are the following:
Holding Ctrl and using the mouse wheel.
Using the zoom buttons which are available on the General Toolbar (Zoom In / Zoom Out).
Specifying the zoom percentage either by using the drop-down list or by navigating to View > Zoom Level. Setting the value to All zooms in or zooms out objects to the full size of the canvas.
Pressing F6 and dragging vertically to zoom.