The screen in your image is aspect ratio disproportionate. You would have to set the correct aspect ratio for it to look correct. You mentioned the specs of your monitor to be 1920X1080. That is a 16:9 ratio.
The drivers that you have installed are not functioning correctly for your display hardware.
You will have to find drivers that support your hardware. If you can't find working proprietary drivers, you'd best start out with the drivers tested and provided by the community on your hardware. The community provides opensource drivers.
You can identify the best drivers provided by the community by running these commands from a terminal screen:
$ sudo apt update
$ sudo apt upgrade
$ sudo apt full-upgrade
$ sudo ubuntu-drivers devices
The first three commands update your repository list and upgrade your OS files and libraries. The last command checks for available drivers for your hardware.
You should see a list of available drivers. The list should look similar to:
== /sys/devices/pci0000:00/0000:00:03.0/0000:07:00.0 ==
model : GK208 [GeForce GT 730]
vendor : NVIDIA Corporation
modalias : pci:v000010DEd00001287sv0000196Esd00001119bc03sc00i00
driver : nvidia-375 - distro non-free recommended
driver : nvidia-340 - distro non-free
driver : xserver-xorg-video-nouveau - distro free builtin
Look for the line that shows the recommended driver and install it. In the case of the above output the install command would be:
$ sudo apt install nvidia-375
There is a GUI version of the driver search. You can get to it by running
Software & Updates. Type the words in the Ubuntu Dash Search Button. Bring up the app. Then click on Additional Drivers.
From there tick the recommended selection and click
By the way, there is a good chance that after you update and upgrade your system to the latest drivers (the first three commands above), the correct 16:9 resolution may become available using the drivers you have already installed.