https://github.com/neovim/neovim/issues/8435#issuecomment-2119332145 C:\Users\UserName\AppData\Local\Packages\Microsoft.WindowsTerminal_8wekyb3d8bbwe\LocalState\settings.json

{
  "actions": [
    {
      "keys": "ctrl+space",
      "command": {
        "action": "sendInput",
        "input": "\u001b[32;5u"
      }
    }
  ]
}

This solved a problem for me.