same monitor, different resolutions using Dell dock WD19

@Reave1905 Fyi "Samsung Odyssey G9" refers to an entire product line that includes a range of very different displays.  But for the purposes of this answer I'll assume you have a pair of G9 displays that have a native resolution of 2560x1440 and that you're trying to run them only at the default 60 Hz.

The WD19 when paired with your system can't access enough video bandwidth to run dual 2560x1440 even at the default 60 Hz, never mind at higher refresh rates that gaming displays like yours might support.  The reason that dropping the resolution isn't having an effect is likely that Windows is only dropping the render resolution, not the active signal resolution.  There are some benefits to that design, but one drawback is that you're not freeing up any bandwidth on the wire.

In terms of solutions, you might be able to change the active signal resolution by changing the resolution within Intel Graphics Command Center rather than Windows Display Settings.  However, the much better overall solution here would be to simply connect one of the displays directly to your system's HDMI output, bypassing the dock.  Yes that will mean one additional cable to deal with, but you'll be able to run both displays at their native resolutions and the standard 60 Hz refresh rate.  That will look much better than running a 1440p display at 1080p resolution, and you'll also preserve the 78% additional pixels you get from a 1440p canvas over 1080p.  That is a non-trivial quantity of workspace.

Hi. No, it is a single monitor with a native resolution of 5120x1440. The monitor allows me to connect 2 displayport cables to it and split the screen into 2 individual displays instead of a single ultrawide display (Also known as picture-by-picture mode)

I am NOT looking to use a high resolution or refresh rate as stated previously. I am just using a work laptop for work purposes and would be more than happy with 1920x1080 across both displays (split from a single ultrawide) at whatever refresh rate is available. instead, I am able to set the first display to 1920x1080 (down from 2560x1440) but no matter what I do i am still unable to change the resolution on the second display to anything higher than 1280x800

Do you have a guide or some instructions for how to access the intel graphics command center? I have searched through this laptop but am unable to find anything.

EDIT: I'm also not able to connect the cable directly to the laptop as the laptop does not that displayport.

@Reave1905 I realize the laptop does not have a DisplayPort output, which is why I referred to its HDMI output. Does your G9 not have an HDMI input?

@Reave1905 Did you try setting resolutions via Intel Graphics Command Center rather than Windows Display Settings as I suggested?