@bubble2k16
It is recommended to add more screen stretch, For example: 299:240 (ntsc 4:3 stretch width only)
Because the vast majority of games are designed for NTSC display (256X224), 299:224 = 4:3,
But show PAL 256X240 (this can be perfect point-to-point display line, 3DS is 240 lines), then...