Can I change the owner's door at will?

First of all, you have to make sure whether the door is changed by the property.

If a property management company changes the internal facilities of the owner's house without the consent of the owner, it shall bear civil liability in violation of the provisions of the Property Law, the Property Management Regulations and the Property Service Contract. Owners should collect evidence, sue the property management company, demand restitution, and claim corresponding economic losses.