You can only do this if you're a PerformanceGuard administrator.
PerformanceGuard administrators are able to customize the PerformanceGuard web interface: Select ADMINISTRATION > Setup > Parameters, and then select the Display tab.
Customization options include (but are not limited to):

Front Page

The page that shows up when you open the PerformanceGuard web interface is determined by the parameter Start URL.

Computer Activity Colors

In computer search results, the activity levels of computers are represented by these indicators:
(active)
(recently active)
(inactive)
With the parameters Client inactivity minutes yellow and Client inactivity minutes red you can change the number of minutes for which computers must have been inactive before indicators change from green to yellow and from yellow to red.

Traceroute Latency Colors

In traceroute output, latency between network nodes is represented by these colors:
(low latency)
(medium latency)
(high latency)
With the parameters Trace Route Limit Yellow and Trace Route Limit Red you can specify how many milliseconds of latency should make the lines between network nodes change color from green to yellow and from yellow to red.

Graph Image Formats

With the parameter Image Format you can determine whether graphs should be shown as JPEG or PNG images.

Why is graph image file size important?  Graph images are often used in reports, so the size of the graph image files will also affect the size of reports. If your reports contain many graphs, and you generate the reports often, and you keep the reports for many days, you may accumulate considerable amounts of data.
The Image Format parameter does not affect interactive graphs. Interactive graphs are created and shown in a different way than other graphs in the PerformanceGuard web interface
By changing web interface parameters you can also disable parts of the PerformanceGuard web interface that your organization doesn't use, change date and time formats, manage log folders and more.