Be warned that if you right click the CT and "Delete Only Foes", even hidden ones get removed. Same with non foes, all of them even hidden ones.
This can be an issue as the fight you in, you want to clear it but you have the next room or 10 prepped, you have to make sure to remove them off the CT each one manually and not the fast way.
This is still very useful. I saw another EXT but it got removed from DMSguild that groups the things in the CT and then you can hide them or not by the group. Also a filter on the CT.

