I don't know of any way to list only the adopted profiles without listing family members as well. But here's something you can try.
In the upper right corner of any profile page, there are five tabs that will display drop-down menus. Click on the first one - "My WikiTree", and near the bottom of that drop-down menu is a link to "Watchlist". This will display every profile that you manage, including family and adopted profiles. You can sort the list by Name, Birthdate, or last Edit Date, whichever one may help you more easily spot the adopted profiles that are among the family in your list.