The task bar is resizable, like a window. Put the cursor on the edge
and make it turn into a double-headed arrow. Then click and drag it to
the size you want.
If it won't resize, it may be locked. In that case, right click on it
and uncheck "Lock the Taskbar," Then try again.
Also note that if you have toolbars on the task bar on multiple lines,
you won't be able to reduce the task bar size to fewer than that
number of lines. Put all the toolbars on one line first.
With the Taskbar unlocked, and the QL toolbar shown, click and drag the
vertical divider on the bottom line, that's between the Start button and
the QL toolbar, up to the top line and right of the QL items, and
release. Now you should be able to re-size the Taskbar, then re-size
the width of the QL toolbar.