So it looks like after I posted this youtube link of the person explaining how he fixed the issue, has now been removed. Not sure why that's the case, but I will explain briefly what I got out of the steps from the video that helped me resolve this issue:
This is for those that have LG 4k monitors and have experienced the screen resolution issues.
- Unplug your USB-C monitor adapter or HDMI from the computer
- On your LG monitor navigate to the settings and locate the section where you can "reset" your monitor back to default settings ... *Be advised, If you do this, it will remove any previous customized settings you had for your monitor.
- Plug your USB-C monitor adpater or HDMI back into your computer
- Go to "settings" / "Display"
- You should now be able to adjust accordingly the resolution with HiDPI resolution for your external monitor.
This worked for me after 3 months of not being able to figure it out. In my case, just resetting the LG monitor settings back to default fixed the issue.
As far as others, I do not have an answer for you. You will just have to try it out for yourself and see if it works.
Please reply back if it works for you or even if it doesn't work. Helps the community keep informed here.
Good luck!