Compiling UE4.23.1 from source is taking up 90GB+ and growing each time I compile!!

I recently uninstalled visual studio 2017. And I can’t find anything related to “setting the toolchain” on this forum. I find comments of people using it, but nobody is mentioning how to “set” it.
Anyway, since I’ve uninstalled Visual Studio 2017, I don’t think the whole “toolchain” thing applies to me.