Codebooktipe type2 for MU-MIMO

Question about MU-MIMO: I keep looking to see codebooktipe type2 for MU-MIMO but I cannot get it.
It is kind of strange that I do not see it in UE logs even if MU-MIMO is activated per cell.
For example at 5G SCG setup.
Actually is important to understand how often users are paired/unpaired fro MU-MIMO per cell since this is a periodic activity.