How to prevent UE source from being built?

I have the UE source version installed because I needed to make a slight change in the built. Now that I’m done, the UE source is rebuilt at times when I dont want it, a “rebuild” to my project alone can cause it. Basically any “rebuild” is out of the question for me even if its only “selection”.
I have unticked the UE in the configuration manager so that it’s not marked for build, but seeing that UE usues it’s own build precompiler system I dont even think it matters what I until in VisualStudio.

How can I make sure the UE is not build anymore?

did you solve this?