There is a couple of settings that help you change the graph appearance. The settings are located in so-called
Hidden Options, and can be easily accessed by pressing
Ctrl + O in the regular settings dialog.
In particular you may want to set
Overlay desk band numbers to
FALSE and increase the
Rates font size.
Please note that you could also resize the graph. First, right-click the taskbar and untick Lock the taskbar. This will enable you to widen the graph. Once done, lock the taskbar again.