You must use a specific Gecko code (readily available on the Dolphin Wiki
Unlike the brute-force hack, this code does something clever: It changes the game's internal camera projection matrix. Instead of stretching the 4:3 image, it actually renders a true 16:9 frame by adjusting the Field of View (FOV) and aspect ratio mathematically. resident evil 4 dolphin widescreen fix
This is the gold standard. It works for the North American (NTSC-U) version of RE4 (Game ID: ). If you are using the PAL version, the codes differ slightly, but the logic remains the same. You must use a specific Gecko code (readily