I have just bought displayfusion to help me manage multiple applications. I have set prevent window deactivation to Shift+ctrl+/ so I can use discord without having to come out of the game (Euro Truck Simulator 2), with little success as it does not appear to work, nor do I hear any sound when these keys when they are pressed, thus I am locked into the game unless I use shift+' to use in game overlay, this is one of the reasons i bought df in the first place.
Please help

I have tried as you suggested, but with no luck, although the hotkeys worked amd I did hear the sound and closed the steam overlay it worked up to this point. Then I have tried running the game and alt+tab out, this does the same thing as before I bought display fusion, I could always access the second monitor this way. The issue I have now is that the game will minimise when I use the mouse on the second monitor, I need to be able to transfer information from the game screen into a document on the second monitor, which I can't do when I can't see it