By default, the chat window is shown on the bottom right, but you can display on the bottom left also.
Here is how you can do it.
(1) Click on the setting button on the upper right of the management page.
(2) Click on [Chat]>[Design]>[Template] on the left side of the screen.
(3) In the section [Position], click on [Bottom left] from the pull down.
(4) Click on [Update].