Glad to hear you found the toolbar.
A bit tricky: I called it the "Graph Builder Toolbar" - because it adds a lot of useful shortcuts for Graph Builder.
On the other hand, some of the functions also work for other reports - so it's really an extension of the (existing) "Report" toolbar.
Sorry to all the users who were looking for a "Graph Builder" toolbar.
Once installed, the toolbar will be available from any report. If it is not visible by default, please right click on the toolbar area and activate the Report toolbar.

Another trick:
via right click, you can move it to the left:

The GraphBuilder window will look like this:
