Fixing screen resolution

i have a 6s and i just want get rid of the black boxes on the sides if anyone can help out i would appreciate it

Go into settings > video and set the aspect ratio to 16:9

hi i can’t seem to get the aspect ratio index to change from anything but 4:3

typing in 1.77 worked

1430x820 thats the resolution i used to have no black bars.

Why don’t I see that option, all I have is an on and off switch of forced aspect ratio and auto aspect ratio? Any help would be nice.

Have you tried updating retroarch?