First you need to enable chart auto-scroll:

1. Right click anywhere on the chart and select ‘Properties’.
2. From the ‘Common’ tab select the ‘Chart auto-scroll’ option and click ‘OK’.

To view the full history:

1. Select ‘Options’ in the ‘Tools’ tab.
2. In the ‘Charts’ you will see a field ‘Max bars in chart’.
3. Enter the number 9999999999999 in the field and press ‘OK’.

You will then be able to scroll through the history with either the ‘PgUp’ button or the left arrow key.