Double-click on the graph origin to open the Frame and Origin tab of the Format Axes dialog.

Use this dialog to set the origin of your graph and to format the color and shape of the axes or surrounding frame.

To change the gap of an offset axis, click and drag the end of the axis.

To draw a box around a graph, including titles and numbering, use the drawing tool. Or wait until you assign a graph to a layout, and choose the border on the second tab of that dialog.