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 graph columns, and to adjust the space between columns. Double-click on any bar to open the dialog.
Rotate columns from vertical to horizontal
You also can use the Rotate button.
Fill in this box to change the baseline for bars on a graph. The default is for the bars to begin at the X axis. Check the box for "Hide Baseline" if you want your bars to float as in the example below.
This is explained in a separate help page.
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.