By sitting on a timeline do you mean you see the 3 video tracks? If so then that is the multicam sequence which was "opened in timeline" and you need to select that clip and "make sequence from clip". Then you multicam edit the sequence.
In my opinion, while it is technically a sequence, multicam sequences would be better explained as a multicam "clip" which is the made into a multicam sequence for editing.
You can select a multicam and "open in timeline" and adjust things like which cam is on which track if that matters to you and you can apply color treatments etc. to the clips. Everything you do to the multicam clip when opened in timeline affects, or is reflected in the sequence made from the multicam clip.