Right click the toolbar and make sure that Lock Toolbars is not checked and
that Address Bar is checked.
Grab the handle at the left end of each toolbar and drag them down. One of
them is probably hiding the Address bar.
If you see the smallest piece of the Address Bar (usually the name)
then stretch the Address bar back to a normal size and move it if
necessary. If the Button Bar or some other bar is to the right of it,
you may want to move that to a different position first.
Don't forget to ensure "Lock the Toolbars" is unchecked in
View-Toolbars.