Currently the old guardians determine the floor grid orientation even if the history is cleared. The only way I found to rotate the floor grid is to do a factory reset on my quest. Then when you go to make a new guardian the floor is rotating with the headset direction. I measured the size of the playable guardian space is about 34.5x34.5 feet when rotated correctly.
Hi Chester, thx a lot. With factory reset you mean not only a reboot but the "volume down and power button holding down thing", right? i will try that.