In the Portal UI, click on "Monitor", select Apps, and click "Print". The "Print" preview cannot show the complete traffic trend for app chart.
Release:
Component: APIPRD
This is due to the print settings of the browser -- the scaling is not correct.
Reduce the Scale on print settings to show/print the full page
The following example is for Chrome - other browsers are similar:
1. Expand "More settings"
2. Change the value of "Scale" until the charts are shown completely.