theology - What does אדון הכל mean?

The Shulchan Aruch says that when saying G-d's name אד-ני one should have in mind that G-d is אדון הכל, master of all. What does this mean?

1. Does it mean G-d controls everything? I don't think so, because people have free choice, and השגחה doesn't seem to enter into it.


2. Does it mean that G-d could control everything? Because that sounds like the description of אלקים, תקיף ובעל היכלת ובעל הכחות כולם, that G-d is Almighty.


3. Does it mean G-d is the Ultimate Cause?


4. Does it mean that everything should listen to G-d? (Which for people would mean 613 or 7 מצות, and for animals and plants would mean they were created to act in a certain way?)