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.
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.