Just move the Terminal
split bar to the left to widen the Terminal
window so that the icon of Move to Bottom
can appear so you can click it.
UPDATE
The Move to Right
and Move to Bottom
icons was removed as of Update 1.29.1 on October 2018.
You can now right-click
the title area of the Terminal
window so that you can find Move Panel to Right
or Move Panel to Bottom
, alternatively, you may click View > Appearance > Toggle Panel Position
.