I had a chance to review your question, you as the boss need to set your standards of what you want from an employee, you need to tell them, in writing what is expected of them. This is usually done during the hiring of a position. Some employees are just generally good and can more or less just do the job with minimum supervision and help. But not every employee is like that. Many of them need structure. I would recommend looking up your legal obligations from where you live in regard to hiring and firing of an employee. You don't to accidently break a law. If you need more advice I actually wrote a book on these topics!
​
https://www.amazon.com/Why-Your-Employees-Hate-You-ebook/dp/B09CNXXPGF
My book will help you
https://www.amazon.com/Why-Your-Employees-Hate-You-ebook/dp/B09CNXXPGF/
You have to walk a fine line, between boss and leader. It’s concerning your employees feel they can waste so much time at work.