I have a problem with FamilySearch, in that it automatically adds ancestors to known people on my tree - ancestors whom FamilySearch draws in from other people’s trees. That is, we get to, say, Joe Bloggs (1756-1810 of Preston Candover) and agree on his b.m.d places and dates, so it adds someone else’s guess as to who his father, grandfather and so on were, even though I think the other tree-master has made an erroneous guess at that point. How do I undo or block these automatically added guesses, and ensure that my tree either continues backwards in accordance with my own research, or simply stops at my 'brick walls' without adding other people's guesses?