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Computer switches between detecting TV and undetecting it, and chimes. How to stop this?

I have a Dell Optiplex 3070 micro with Intel UHD Graphics 630, connected to an old LG TV over HDMI. The OS is Windows 10 Pro. I keep the PC on, and when I switch the TV to an input that is different from the Dell, the computer starts to switch between recognizing the screen, and not recognizing it. It chimes as when new hardware is connected, and disconnected, which is rather annoying.

If I connect to the PC via a remote desktop, I see the resolution switching between 1024×768 to 1920×1080. Is there a way to lock the settings to 1920×1080, so that this would not happen?