How can a manager deal with employee misconduct in a way that pleases Allah without it being perceived as weakness?

The path to safety from employee injustice is to apply the labor laws agreed upon in the contract, unless they involve a violation of Islamic law, in compliance with the Almighty’s saying: "O you who have believed, fulfill [all] contracts." The responsible person should combine gentleness and strictness according to the situation, and be lenient with employees unless it harms the work or violates company regulations, due to the Prophet's (peace be upon him) saying: "O Allah, whoever is given charge of any affair of my Ummah and makes it difficult for them, make it difficult for him; and whoever is given charge of any affair of my Ummah and is lenient with them, be lenient with him."