What's the best way to manage an employee who's causing a negative stir?‎

Trying to motivate him to stop being a negative member ,, if he insists on this attitude , HR with his direct manager should have a discussion with him : 

- Clarifying the negative points in his attitude ,, 

- Agree on an Improvement Program which could include training or cases 

- Weekly Follow up meetings with Actions and evaluation if any positive progress 

First, you must know whether this is a permanent behavior or an occasional condition for some reason. If it is a behavior and a nature, then you should be warned and aware of what is causing it to work. If not, then you should be transferred to a place or position to structure it and benefit from it. From his negative noise, and if not, keep him away, as we are not a rehabilitation center

The objective of employee orientation is not to test the new employee’s knowledge or skills. Instead, it’s meant to help them integrate into the company, understand their role, and get familiar with the company’s culture and policies.

Try to persuade them to do their work as expected from them within a limited time and if they do not abide, I will request for their immediate replacement.