this scatter chart has 2 filters one for builders and the other for subdivision. both filters are set up to show relevant values. the plan is once I choose a builder it will display in the second filter only the relevant subdivisions for that builder, bit also once I chose any subdivisions for that builder, I can return an see other builders associated to that subdivision. This is working fine as can be verified in the shared link.
Now what I want to do is Fixate a builder through parameter so I can embed this chart in my system and offer it to a customer having an initial display for their data and not the whole universe, then by choice they can compare themselves vs their competitors
Set that first filter - the builder one to be a Context Filter and you will get the desired results. The context filter forces the viz to consider that filter first. See my version of this here - Tableau Public
I hope this helps and please mark this correct if this resolves the question.