My graphic card is 4080s with HDMI, 3 DP ports. Also have HDMI on the mother board. Here is my set up.
1. TV set up : only the HDMI on graphic card
2. Normal Dual setup: 1dp and 1 HDMI on the motherboard
3. Triple set up for Sim racing: 3 DP from graphic card using DP splitter to active.
Everything working fine at first, but now if I don’t unplug the hdmi for TV or turned the tv on, the normal dual set up won’t work, the monitor will just go off. It’s very annoying, Sometimes after I played game on TV, then I have to go down to desktop to unplug the hdmi, otherwise I have to keep the TV on to continue daily work for my normal set up. Do you have any idea why?
I try to find settings in TV but i dint find any useful set up. If I turned off the TV, all my dual monitors will go off, very wired.
Thank you very much. I will attched my "noral set up".
Yours Xin

Dear Owen:
Sorry for the late reply. here is the log. first i turned off the TV, so the dual monitors went off, then I turned back on.
After that i reboot the computer with tv off, and then turned on again. Hope the log capture the porblem.
Thank you so much.

Here you go with the log. This time, i first unplug the TV. set the Normal profile again. Then set the TV. Turn off the computer. unplug the TV cable, turn off the TV, plug back in. Start the pc, this time same issue, if i dont turn on the TV, the dual monitor just be off.

windows is the same issue,i have to keep the tv on to make the dual moniters work. i video a clip, you can have a look.

Yes, I understand its 99% not the display fusion's problem. But i serched the whole internet, didnt find a proper solution. Thats why i turn into you guys who are expert on mutiple monitors Hope you guys can help me. Its really annoying.Thank you very much.

Thank you so much, i switched tv from game into pc,and it works, however the sound system will not automaticlly change back to my pc speaker like it used to,it will stay with TV output. but hey, i dont have to unplug the hdmi anymore. W for me. thank you.

Is it an HDR TV by any chance? I have the same issue, but it didn't occur with my SDR TV. My solution to this problem is creating separate display profiles, with the TV only active when I'm going to use it. I have created shortcuts for switching between the different profiles.