You have never been able to hide live TV in the guide on any TiVo ever made. On the Premiere (HDUI) is is in a box rather than behind the guide. If you are playing a recording and go in the guide, you see the playing show in the box.
Premiere (2TB upgrade) Premiere (retired)
TiVo Mini (v1) x 3
Left DirecTV 4/15/07. Left TWC 8/8/11. Now on Comcast Xfinity.