In chart properties, under Axes tab, check Minor Grid in Expression axes.
And in Scale section, set Static Min, Static Max, and Step as expression as Min(Expression), Max(Expression) and step what you want respectively.
if you want to have dots instead of circles : right click > properties> Expressions> select "dots" from the drop down next to the symbol check box
if you are talking about the amounts on the axes: right click > properties> Axes > uncheck "force 0"
hope this help... let me know if this is not the problem you are facing
Please set all three property Static Min, Static Max and Static Step together.
Or check if you have valid data to show in the chart.
if this not solve your problem please attach your QVW file.