Adobe XD browser preview suddenly not filling the space.

Hey there.
So I have been working on a design today. So far there has been no issues with my design when I share it for review.
The screen has been filling up nicely, representing a genuine site.

But now all of a sudden the screen does not fill at all, it is the exact same design, no changes. I looked up another thread, and tried the preview link the support team posted, and it filled up my screen width nicely.

I am not sure what's up, but I would love to have this fixed as I have a presentation tomorrow.