LightDM, Pop_OS and Monitor Timeout

I used GDM Settings and broke GDM, every normal fix doesn't work to restore GDMs first login screen back to normal (all colors are black except background and icon, trails when items move).

I switched to LightDM and its working perfectly EXCEPT my monitor doesn't sleep when LightDM lockscreen is up.

I'm newer to Linux so I don't know how the Monitor sleeping system works, or what the hierarchy is, or configuring it.

I know that Pop_OS and dconf editor can both edit the Monitor timeout time, but that doesn't seem to affect LightDM, any suggestions? (I'd rather work on this than GDM because I've spent hours on GDMs theme being busted)