SketchUp Make 2017 - cannot customize toolbars

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Go Top menu item View/Toolbars then use the toolbar dialog that opens to customise.
Have a look here.

Custom toolbars

Continuing the discussion from Circles on cyclinders: Yes it’s a custom bar. I have customised the Measurement toolbar. You can make your own by opening the toolbar dialog and creating a new one or changing an existing one. You can drag and drop tools from any Native toolbar. Use ctrl when you drag to drag a copy to the new bar rather than drag the original off. If you happen to mess up a toolbar by dragging something off and you want it back, just select the toolbar in the dialog and hit the…