The graphs on the Monitor tab are:

When the Graphs tab is first opened, no graphs are visible. To view a graph click the + button on the left or, to view all graphs, use the expand all button.

The larger size of graphs is the primary reason for viewing graphs on the Graphs tab rather than on the Monitor tab. Additionally, you can only show a maximum of six graphs on the Monitor tab; the remaining graphs can only be viewed from the Graphs tab.