Hello
The horizontal alignment is not working.
I tryed at the playground to be sure.
var panel = new BABYLON.GUI.StackPanel();
advancedTexture.addControl(panel);
panel.verticalAlignment = BABYLON.GUI.Control.VERTICAL_ALIGNMENT_BOTTOM;
panel.horizontalAlignment = BABYLON.GUI.Control.HORIZONTAL_ALIGNMENT_LEFT;
Hey and welcome!
do you mind creating a repro on the PG?
panel.width is probably just 100%
@JFerret as suspected 
Solution 1; - Adapt to children width
chatStack.adaptWidthToChildren = true;
https://www.babylonjs-playground.com/#XCPP9Y#1543
Solution 2; - Hard-code same width as children
chatStack.width = ā400pxā;
https://www.babylonjs-playground.com/#XCPP9Y#1544
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My apologies, iām new to Babylon and java script 
Thank you for the solution, it works like i wanted!