Cycle through open windows using Alt+Tab.
If Quick Launch is too wide, you can unlock the taskbar and resize
Quick Launch using the mouse. If too wide due to the number of icons
it holds, reduce the number of shortcuts or consider using a double
row taskbar.
Personally, I use a two row taskbar - one row for Quick Launch and
one row for open applications. I set this up by unlocking the taskbar
and then dragging the right most border of Quick Launch down to the
second line. This was done with no other windows open so that were no
buttons on the taskbar to interfere with the creation of the two rows.
A double row taskbar can also hold two rows of QL shortcuts to one
side while the other side shows two rows of open window buttons.