There is only ONE tree in Wikitree. We are working towards creating ONE global tree and every person has ONE profile. When you add in your family members, some of your ancestors may already be on wikitree, because they will have other descendents as well as you.
We collaborate with each other in provideing sources and connecting relatives. No profile belongs to any one person exclusively. We just manage them.
If you are looking for a list of profiles that you manage or are on the trusted list for, you can check your Watchlist which is in the menu (At top right) under "My Wikitree".