This solution will probably work for many other Computer & Laptops as well!

We troubleshoot and fix the issue of the Gaming Monitor being stuck on 99HZ/100HZ instead of 144HZ. I tried multiple things out so why not record the process and maybe help someone out.

Thunderbolt 3 (USB‑C) to Thunderbolt 2 also didn’t work in the test!

Laptop
Product: Lenovo Legion 5 15IMH05H Model: 81Y6003QMH
Monitor
Lg 27Gl850-B.Aeu 27″ Ultragear Nano Ips 1Ms Gaming Monitor With G-Sync-Compatibel