will future of iterations plan to display the resolution properly?? in some ways i wish i got a 16:9 4k monitor now, most games play fine but there are some that don't play nice with that 3440 x 1440.
You have some 21:9 codes here : https://forums.dolphin-emu.org/Thread-gc...-21-9-60hz
Alternatively you can also try the "widescreen hack" option but it tends to break many things, depending on the game you're running.