DamianMcLoughlin, If you right-click inside of the Tree window, but not on a node, you should see the Show diagnostic plots and Show tree overview options. Further, if your mouse has a scroll wheel, you can zoom in and out of the decision tree with the mouse wheel. Hold the shift key and left-click in the Tree window to move the decision tree. Another trick to consider is putting your browser into full screen mode to gain more screen real estate. The keybind for this is typically F11.
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