Graph Settings tab of Format Graph dialog
Use the Graph Settings tab of the Format Graph dialog to change the direction of bars on a graph from vertical to horizontal, to set the baseline for bars (but they really should start at zero), and to adjust the space between columns. Double-click on any bar to open the dialog.
Spacing
This is explained in a separate help page.
Discontinuous axis
When you have a gap in a Y axis, choose whether or not you also want a gap in any columns that span the gap. Not leaving a gap may make your graph misleading.
Shape of the legend key
For bar graphs, choose between square or rectangular (wider) boxes before the legend text.