Can I set one Project to British English and another to American English?

Hi! I’ve got multiple projects on the go at the moment and I use a new Scrivner file to keep track of each one. Is it possible to set one project to spellcheck in US english without it affecting the other projects, or does setting a language preference change it for the entire program and all projects?

I know how to change languages, I just don’t want to have it bleed over into other work without my noticing!