Recalbox 8.0 does not have support for composite video yet, since Recalbox 7.2
The properties to activate a composite video signal in the boot configuration files have no effect since Recalbox 7.2. What is happening!?. This is the correct way of what video games should look like in the American region (NTSC). Here we never had a SCART cable or RGB signal in our childhood.
Hardware: Raspberry Pi 4B
Boot configuration file:
recalbox-user-config.txt (for Recalbox 7.2 and higher) / config.txt (for Recalbox 7.1.1 and lower)
...
#custom config
enable_tvout=1
sdtv_mode=1
hdmi_force_hotplug=0
hdmi_ignore_hotplug=1