Do you mean that window always has CPU #0 cores current clocks displayed? But why exactly this information - a very strange choice in my opinion..Those items cannot be changed.
As far as I can see that info is displayed as a table (or a graph if you choose it for a specific sensor(s)). But I need to see "live" chart (like that floating window looks like)..Open the sensors window from the main window (or start in Sensors-only mode) for the full set of sensors which can also be configured.