OK try this, drag both the right library browser and left system work space windows as far left and right as you can, if you can see even a hint of blue from the now floating tool bar, double click the blue and it will snap back into place up at the top.

For everyone else who feels like a rebel, at the very far left of the upper tool bar is a teeny tiny vertical white rectangle if you double click on this the bar will detach and become a floating bar.

The same is true of the lower tool bar