The Prevent Window Deactivation function doesn't work with all games. It depends on how the game handles the window losing focus, and whether or not it locks the mouse to the game window.

Have you already tried the different methods in this guide?
https://www.displayfusion.com/Discussions/View/preventing-game-windows-from-minimizing/?ID=ab5ec329-4190-4dff-8d63-e9b5f611656e#first

Yeah, I think Actual Multiple Monitors does things a bit differently that we do for their Ignore Deactivation function, but I'm not sure what the differences are.

If it's not working in the trial, it won't work with the paid Pro version either. Trial and Pro have the same features.

If we're able to spend some time improving the Prevent Window Deactivation function in the future, we'll be sure to post an update here to let you know.

Thanks!

Not likely, sorry. Our function just prevents the game from receiving the message that Windows sends when the game loses focus, we're not doing anything super special