You are a perfect candidate for Dwight's book, Lightworks in ArchiCAD. Consider getting a copy.
The problem you have encountered suggests that you are rendering with LightWorks and not the internal engine. However, you changed your materials in the Internal Engine panel of the Materials dialog, so things look good in OpenGL in the 3D window.
The most simple fix, which may mess up other settings though, is to show the LW panel in the Materials dialog and click the button that says something like 'match with internal engine'. Render again, and your tile should be rotated (and sized) as desired.
Karl
One of the forum moderators • AC 26 USA and earlier • macOS Ventura 13.2, iMac Pro 10-Core, Radeon Pro Vega 64