To set the Log Viewer preferences:
Click File | Preferences.
On the Preferences dialog box, under General, set the preferences:
Log Viewer Size - the number of items or rows that are displayed in the Log Viewer.
Update Frequency - how often the log viewer is updated. The process execution engine is constantly writing information to the log file. The Log Viewer is updated automatically at the interval that is specified in this field.
Time Zone - If you do not select a time zone, the Log Viewer gets the default time zone from the host process execution engine.