RetroPie doesn't recognize my 7 inch display

[A Former User]

Hello,

I just set my Raspberry Pi 4 up with RetroPie 4.8 for the Raspberry Pi 4. My Raspberry is connected to a 7inch screen (https://www.waveshare.com/wiki/7inch_HDMI_LCD_(C)#:~:text=Overview,used as a computer monitor.) but RetroPie doesn't recognize that I am using this screen/ the resolution of the screen, which results in a black bar on the right side of the screen. I am thinking this because in raspi-config it only shows this resolution, when the resolution I need is 1024 × 600.
I already edited my /boot/config.txt and added this line

but RetroPie still has this black bar on the right side:

I installed the RetroPie image from the Raspberry Pi Imager. I also saw somewhere that RetroPie would recognize the screen after rebooting, but after rebooting multiple times there still is the black bar on the right side. Does anyone know how to fix this? Thanks in advance

[mitu]

@3250847 said in RetroPie doesn't recognize my 7 inch display:

I already edited my /boot/config.txt and added this line

The line is not enough and it's incorrect. The configuration you should add to the file is:

hdmi_cvt=1024 600 60 6 0 0 0
hdmi_group=2
hdmi_mode=87
hdmi_drive=2