The game refuses to work with a mouse when you have a controller attached to your system. For some stupid reason it is not possible to select any other type of input if the game detects a controller.
The simplest solution, besides fixing this very very basic interface bug, is to physically disconnect your controller.

I find this very annoying for a windows game!
Even more annoying is that I have yet to find a way to edit game reviews on GOG once you have saved them...

Yes, it's the same issue with the "normal" Gwent game, it's always been, and CDPR stone cold don't care or aren't competent enough to implement proper device switching. It's completely inexcusable.

If they won't let us edit reviews, I wish we could at least delete them... Been hoping for this since years ago.