Hello Megalomaniak,First of all, thanks for your time.The problem with the solution you are proposing is that the aspect ratio of the centered frame is not maintained. When the window is resized vertically, the frame will be resized only vertically, the width of the frame will be the same. In order to make it work I will need to add a script that modifies the width of the frame, recalculating margin-left and margin right, in order to keep the frame aspect ratio (old_width/old_height = new_width/new_height).If I don't find a way to do it just configuring the GUI elements, I will need to add the mentioned script. Writing the script is not a problem, I was just trying to avoid it. I was afraid of missing some important parts of the GUI nodes that helped me to accomplish this.