Changing the number of visible snapshots in the chart
By default, a chart contains eight snapshots in a bar chart or 30 snapshots in a line or area chart. This is defined in the Number of visible snapshots field on the Graphics page of the Properties window. You might, however, want to examine a longer snapshot period in a bar chart or view fewer snapshots in a line chart. You can change the default to a number from 4 through 99 or the number in the Maximum number of kept snapshots field.
You can also use the plus (+) and minus (-) signs next to the x-axis of the chart to increase or decrease the number of snapshots displayed.
The Maximum number of kept snapshots field defines how many snapshots are kept in memory by the data view. When this limit is exceeded the oldest snapshot is deleted and the latest snapshot is added. You can change the number in this field according to your needs.