Just downloaded Adobe XD and after opening it i see no smaller window asking for size input. Ive looked at videos and they all show a small box when you open it saying iphone size, tablet size, web, custom. I dont see this and have now way of opening it. 
This is what i see when I open XD.
Hi Guys,
The Windows 10 version of XD doesn't have a Welcome screen (yet), so you will want to create your artboards manually in the document before adding any artwork or prototyping. Select the Artboard tool (below the Text tool), and you will see a scrollable list of preset artboard sizes on the right hand size that you can use. Click on one of the presets and it will place that artboard on the canvas.
hth,
Joe
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