AML-S905X-CC Composite overscan

Anyone have any advice on locating the configuration for composite overscan on Debian 11 for this board? I used the provided debian image, running no de/wm. HDMI shows perfectly fine but composite via CVBS is zoomed in, overscan, on any display i use.
None of my displays have their own settings for overscan, i need to do it from the boards end, but there isnt exactly a configuration file in /boot/ which seems to have composite overscan settings?

If you are using x11, you can use xrandr to set underscan. If you are on wayland, underscan is compositor specific.