Someone is fairly regularly this year, 2021, adding to my tree. I want to stop this.
Welcome to the "Community.FamilySearch" Forum.
I am just another 'lowly' User/Patron ...
Short Answer: Technically, under normal circumstances, you CANNOT.
Here an old 'standby' of mine, that I have previously proffered on occasion ...
Most new (and, some old) Users/Patrons DO NOT understand the basic 'nature' and 'premise' of "Family Tree" of 'FamilySearch', when they join in.
Please let me explain ...
We do not have our OWN "Tree" in "Family Tree" of 'FamilySearch'.
We ONLY have "Branches" (ie. Ancestral" lines), that are interconnected, in this SINGLE "One" World "Tree", for all of us, that is "Family Tree" of 'FamilySearch'.
"Family Tree" of 'FamilySearch' is NOT like 'On-Line' "Websites" (eg. "Ancestry_com"; or "MyHeritage_com"; or, the like); and/or, 'standalone' personal (computer) programmes (eg, the OLD, now no longer supported, "PAF"; or, "Ancestral Quest"; or, the like).
We DO NOT have "Private"/"Personal" 'Trees' in "Family Tree" of 'FamilySearch' like other 'On-Line' "Websites"; and/or, 'standalone' personal (computer) programmes.
We do not even, own; or, manage; and, are NOT even responsible for, the "Deceased" individuals/persons in "Family Tree" of 'FamilySearch'.
And, most importantly ...
We DO NOT even, own; or, manage; and, are NOT even responsible for, Our OWN "Deceased" Ancestors/Family/Relatives in "Family Tree" of 'FamilySearch'.
"Family Tree" of 'FamilySearch' is built on a "Open Edit" Platform - hence, why any registered User/Patron can "Edit" (ie. Add, Delete; and/or, Change) ANY "Deceased" individual/person in "Family Tree" of 'FamilySearch'.
That Said ...
IF, you have either, tried; or, have successfully contacted, the OTHER User/Patron; and, after "Collaboration", the OTHER User/Patron, carries on REGARDLESS of the "Collaboration", you CAN "Contact" 'FamilySearch'; and, ask for help/assistance.
For starters ...
Here is a "Knowledge Article" in 'FamilySearch':
Failing that ,,,
Here is another "Knowledge Article" in 'FamilySearch':
Where is states, among other things:
If you have questions regarding inadvertent, suspicious or potentially malicious errors in records that you are unable to resolve per the instructions above, contact FamilySearch Support.
Where, the aforementioned is the last sentence/statement; and, very appropriate WHEN "Collaboration" FAILS.
Of course ...
IF, there outright abuse; THEN, this "Knowledge Article" in 'FamilySearch' is appropriate:
I hope all this helps, somewhat.
Thank you Brett. I have not contacted the other person but I did manage to delete "his/her" additions. You left a very informative answer and I appreciate that.
This recent training video may be helpful to you - Kathryn Grant explains the 'communal/shared' nature of FamilySearch Family Tree and gives tips and tricks and outlines some cautions on using the shared tree on Family Search, particularly if you prefer working in a 'private tree' model (which is not what FS Family Tree provides).
Hope it helps.