Signal display settings specify the range of the Autoscale. The default settings are 60 minutes on the X-axis and a Y-axis range large enough to encompass all signals.
Open the Online Signals window.
Click Signal Display Settings .
Select the signal you wish to scale.
Select the Predictable range check box.
Adjust the corresponding Y-axis in the space provided.
Edit the time in minutes you want displayed in the X-axis range.
Click OK.