If you have multiple GPUs DXVK may become confused and your windows games on your steam may stop working. To fix it you can force DXVK with the following env varibale.
To get the list of GPUs and names you can use
vulkaninfo command. You can use partial names it will work. More info here: https://github.com/doitsujin/dxvk/blob/master/README.md#device-filter