Use left mouse button to draw lines and objects.
To manipulate objects, first select the pointer tool from toolbar. Then click on an object you like to edit.
Move objects by dragging from object stroke or background.
You can also move single points around to change object shape. Rotation handler allows to rotate object around its centre.
Navigating on page
Use scroll button to move through the page. Default scroll is vertical. For horizontal scroll hold mouse cursor over horizontal scrollbar or hold down Shift key.
You can also move the page when you drag with right mouse button.
To zoom in or out you can use the zoom control below page. Alternatively you can hold down Control key and use mouse scroll for zooming.