Setting up dual screen from two GPUs (failure in writing xorg.conf & black screen only with a cursor)

I have Ubuntu 18.04.5 LTS with two 2080Ti GPUs and would like to set up dual monitor rendered from each GPU.

hdmi cables are connected to each but only one monitor was working.

I googled a bit and figured that I need to change nvidia settings

First thing I check was nvidia-smi and I confirmed that both GPUs are visible

from the windows I get from sudo nvidia-settings I saw that one of the monitor is disabled.

So I Configured it to X screen 1 (it was the only choice other than disable)

But when I clicked apply, I saw the following pop up

and when I click save, I was getting Unable to open x config file (again, even though I opened it with sudo).

I checked /etc/X11 folder and found that I don't have xorg.conf file.

Next thing I tried was to manually add a xorg.conf file from preview text. The following is what I got from preview.

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 455.32.00

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
EndSection

Section "Files"
EndSection

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Samsung C27F390"
    HorizSync       30.0 - 81.0
    VertRefresh     50.0 - 72.0
    Option         "DPMS"
EndSection

Section "Monitor"
    # HorizSync source: unknown, VertRefresh source: unknown
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "Samsung C27F390"
    HorizSync       0.0 - 0.0
    VertRefresh     0.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce RTX 2080 Ti"
    BusID          "PCI:1:0:0"
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce RTX 2080 Ti"
    BusID          "PCI:2:0:0"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-2"
    Option         "metamodes" "nvidia-auto-select +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "metamodes" "nvidia-auto-select +0+0 {AllowGSYNC=Off}"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

After rebooting, I noticed that my mouse was going to the other monitor but the screen was black. Also, the cursor was just x as shown in the following picture.

Can anyone help me with this issue? This is really frustrating...