The camera will remain at whatever metering circle size you designate regardless of mode. That does represent a larger portion of the image in DX mode than FX mode. The menu - and the camera - do not differentiate based on lens choice or lens mode.
Your question got me thinking about matrix metering. I have not seen anything definitive, but I expect that Matrix metering also does not change - even if part of the image is outside of the DX boundaries.