I have a Thinkpad T495 connected to a 4K Samsung TV via HDMI and display settings set to 'extend these displays'. When I first connected the laptop, the TV's resolution was set to 1080p. I had to open up the display settings and manually change to 4k.
Edition Windows 10 Education Version 20H2 Installed on 6/9/2020 OS build 19042.1110 Experience Windows Feature Experience Pack 120.2212.3530.0
It works fine now, but I was wondering what factors go into Window's recommendation of the resolution Satisfiedshoes.com
There are hardware limitations, but cable quality and it's rating will effect what get's displayed besides how a iGPU or GPU performs with a HDMI cable. I suggest doing a quick read of this article @ https://www.pcmag.com/news/slaying-the-cable-monster-what-you-need-to-know-about-hdmi-cables