To whoever still has issues with setting up the monitor, here is maybe something that may help you, I am using the new LG Ultrafine 4k which I bought in Jun 2021, I also have an LG Ultragear gaming monitor:
The LG Ultragear has two HDMI and one display port, not a lot but enough for me.
The desktop I am using is an Alienware R12 with RTX 3080 which has three display ports and one hdmi.
I need to use both of the monitors for working and gaming, I tried a lot of the methods in the previous 15 pages, I used a lot of cables and adapters and none of them work (maybe I missed something lol). Eventually, I was able to make it work using the cable that was mentioned on page 6:
Amazon Basics Bi-Directional USB-C to DisplayPort Cable - 6-Foot
www.amazon.ca
I didn't use the Wacom adapter which is like 100 CAD. However, it does work. I returned it eventually since that amazonbasic cable is all you need. (big thx to DeanL, if it is not for him I won't be posting this here)
The only change I did is that previously, I was using a dp to dp connecting from my LG Ultragear to my desktop, I changed that with HDMI to HDMI, and left three Displayport left on my desktop, now using one of the display ports and cable to connect to the LG ultrafine 4k.
One thing I should mention is that because I am using an HDMI to HDMI cable that came from a Nintendo switch, I am only running 2k 144hz, which is slightly lower since the LG Ultragear 27gp83b-b is a 2k 165hz, so I am purchasing another HDMI to HDMI cable which supports 2k 165hz.
Thx to whoever helped me with the setting up, good luck!