Prototype function now doesn't use the fullscreen size

Hello, I was trying to see the design in full-screen size 1920x1080, which is my current monitor size. Before you click Fullsize or fill screen, and it will do the work.

Now it doesn’t use all the screen size and there is a like a mask to scroll into it and move around

Here an example

Anyone know how to make Figma use all the available space (fill the screen as before)