On the WatchList page, you'll see the following line near the top of the page:
"This is your Watchlist. [more info]"
Click on [more info] and quite a bit of information will pop up including:
The status column indicates whether the profile is managed M by you, or for an Active A WikiTree user, or Pending P i.e. they've been invited to join WikiTree but haven't responded yet.
Hope this helps. :o)