Action Request Window, aka Fast Path window, missing in SAPgui

SAPgui should have a text box at the top left of the screen where you can enter a "fast path" code to get to a particular transaction screen. There is a small white triangle to the right of the fast path entry box, that is, to the left of the Save icon.

If you have inadvertently pressed the triangle, so that it now points to the right, the fast path entry box will have disappeared.

To bring back the fast path entry field, or Action Request window, press the triangle again so that it points to the left.