Example of unwanted EXWM behaviour

This demonstrates the EXWM behaviour that I would like to change. In this example, rather than the LibreOffice X window replacing the Thunar X window, I'd like it to open in a vertical split/window as it would in the i3 tiling window manager (and others). As the creation of the LibreOffice window is triggered from Thunar, I don't know how to instruct Emacs to open it in another split/window. ... https://www.youtube.com/watch?v=OtTBZUcp2dk