Here's how to change the zoom level of the Zenology plug-in windows.
Perform the following procedure.
In the Zenology window, click on the Menu button:
Select the "Zoom" option:
Click and hold within the window and drag it to the desired zoom level:
To change the zoom level of the Tone Browser window, hold down the cmd and k keys, then click and hold within the window and drag it to the desired zoom level: