Baldur's Gate 3 Toolkit can't interact with game

[CuriousCactus]

Hi,
I'm trying to get the Baldur's Gate 3 modding toolkit running on Mac.
I've gotten most of the way there, but I can't interact with a level using the mouse or keyboard in the game preview subwindow. I think it's not taking focus - it hasn't hung as I can see the idle animations of the character and move around by selecting assets. I wonder if anyone has met this sort of thing before, with a window rendered within another. Interestingly, it has another subwindow where you can interact with a single asset, and that one works fine.
Thanks in advance, this is my first time using wine and I'm really impressed I can get this far!