Contra: Rogue Corps does not offer a traditional full-screen mode. The game is designed with a fixed aspect ratio and display size. However, you can adjust the display settings of your gaming platform or monitor to maximize the game's screen utilization. On PC, you can try adjusting the display settings in the graphics driver control panel. On consoles, you can explore display settings in the system menu to ensure the game is displayed at its maximum size on your monitor or TV. Keep in mind that altering display settings may impact image quality or aspect ratio.