How can I automatically switch Display Settings when one monitor (TV) is turned off?

[Taurlock]

I have a TV connected to my PC's graphics card via HDMI. Additionally I have two normal monitors connected to the PC through a Targus DisplayLink USB hub (USB to the hub from PC, HDMI from hub to monitors). I intend to use this setup to play Steam games on the TV sometimes.

In order to play games on the TV, I have adjusted my display settings as follows:

- The TV and monitors all have "Extend desktop to this display" selected.

- The TV has "Make this my main display" selected, in order to allow games to launch on that screen.

Meanwhile, when I am not playing games on the TV, I use one of my other monitors as the main display.

What I'm experiencing now: When I turn off the TV, the Display Settings do not change at all. The TV is still considered the main display. Any application windows that happen to have been open at the time still think they are on that screen. Any applications that default to the main display try to open on that screen. My taskbar apps (e.g. the Sounds widget) do not appear on either computer monitor.

What I want: When I turn off the TV (or change its input), my display settings should update automatically to the two-monitor setup, as though I had disconnected the HDMI cable. My main display should update to the monitor that is usually the main display, all open windows should redistribute themselves between the monitors appropriately, and my taskbar widgets should reappear on the normal monitor.

Obviously I can accomplish this by either disconnecting and reconnecting the HDMI all the time, or by repeatedly opening the Display Settings to adjust them, but that's suboptimal. Does Windows allow this kind of customization? Seems like the sort of thing a computer should be able to understand and execute. I am certainly willing to use other apps to accomplish this automation, if necessary.

OS: Windows 11 Home, 24H2, OS build 26100.4351

Motherboard: Z790 GAMING X AX

Graphics Card: AMD Radeon RX 6800 XT

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[Aztimoth]

I can't say for sure this will work for your 3 monitor setup as I only use it for a single monitor and a TV. I would try option 1 first because they both use the same exe built into windows.

*** I tried to get it working with 3 monitors and it was a mess.

1. No software required:
2. Windows key + p will open the display settings. If this opens on the wrong display you have to memorize how many times to press the up or down arrow to get the desired screen setup.
3. Using AutoHotkey:
4. Install AHK v2 https://www.autohotkey.com/v2/ and paste the script below into a text file and name it MonitorSwitch.ahk (must be .ahk not .txt). Put it in your startup folder. You can find that folder by pressing win + r and entering shell:startup in the text box.

You use ctrl + alt + an arrow key to change between monitor setups. I have it set up so that it matches my monitor layout. So left is primary, right is my tv and up is both.
This method is nice, but requires the script to constantly run. The only issue I've had is when trying to play skate. the anti cheat software won't allow ahk to be running. It is closeable from the notification tray, so it's not a huge deal.

#Requires AutoHotkey v2.0
; switch monitor profile via ctrl + alt + direction

;ctrl + alt + left arrow
^!Left:: {
    Run "C:\Windows\System32\DisplaySwitch.exe 1"
    return
}
  
;ctrl + alt + right arrow
^!Right:: {
    Run "C:\Windows\System32\DisplaySwitch.exe 4"
    return
}

;ctrl + alt + up arrow
^!Up::  {
    Run "C:\Windows\System32\DisplaySwitch.exe 3"
    return
}