Boot failing while trying to setup CSI Drivers

How do I edit the configuration file? I tried following How to use /boot/extlinux/extlinux.conf after jetpack 5.0 - #5 by lr75021 but when I go to Boot Manager, there is no eMMC option, but an SD one as shown in the screenshot in my original post and when I select that, it defaults to Direct Boot, not giving me an option to edit the configuration file