I don't think I've ever used anywhere in street, shop or restaurant yuan/renmimbi, at least not in Beijing and around, some people may use yuan, hardly anyone renmimbi
here you have AI answer based on Reddit thread, which I can confirm is correct:
"In everyday spoken Chinese, kuai (块) is overwhelmingly the most common term used to state prices. Yuan (元) is used in formal writing and official contexts, while renminbi (人民币) names the overall currency system like "Sterling" or "USD" rather than a daily price unit."