Just like any other Windows window, the screen window is freely adjustable. The effect on the screen content, however, is different.
When you scale it by dragging any of its corners, window and screen content will keep the proportions.
If you drag at one edge of the screen window, the editing area increases in size. The actual screen border is displayed as a white line.
Aspect ratio and cropping area can be reset by dragging one of the corners while pressing the Shift key.
If the screen and its content is to be displayed at the presentation output size, right-click the screen and select Restore output size. The output size is defined in the Screen Properties.
Double-click the screen window you can change over between fullscreen and window mode.
In the screen window title bar, the current size of the screen content is displayed as a percentage of the window size separately for X and Y axis.
The title bar also displays the current frame rate (fps) and the texture data size (MB) for hardware rendering. The frame rate defines the rate at which the graphics card outputs newly rendered pictures. Texture data size defines the quantity of image data the graphics processor is processing for the current display. Of course, the graphics memory should also be able to accommodate further textures required for the next display. Both parameters can be used for analyzing bottlenecks. The frame rate drops when the graphics card processor is running to capacity. With a very low frame rate, display will start being jerky.
Resolution and quality of the picture or video preview in the screen window are dependent on the quality of display or texture data. See Screen Properties.