how to build game with aspect ratio ??

how can i set resolution to landscape 18:9, i use native aspect ratio and in scene i already set to 18:9 landscape, but it’s not working. Do I need to make a script ???, by the way i use unity 2018.2.15f1136096-capture.png

I’m not sure but try to un-check the aspect ratios under “supported aspect ratios”, that you dont want, and make the others check it will pick your 18:9 ratio.