Hello, sorry if this has already been covered somewhere. When I start a dialogue the box will appear at the bottom of the screen when there are no choices and not much dialogue. If the dialogue is long or if there are choices then the box jumps to the middle of the screen. So it seems when the box grows in size vertically then the position changes. Can you point me in the right direction as to how to fix the positioning issues I am having? Thank you. 

That is how it's supposed to work, otherwise the text box would go downwards and get cut off by the bottom edge of the screen.

What you could do though, is add a scroll container as the parent of the Text node, like this:

* Make sure to increase the Y of Min Size, otherwise you won't see any text.

Other than that, you might want to play around with TextBackground>Grow Direction>Vertical property as well as its screen anchors to get the desired behavior.