Hello again.
Thank you to those who kindly took their time in trying to give an answer to this question.
Judging by the answers I received, I came to the conclusion that perhaps I didn't formulated the question correctly, so here again it goes with images.
Image 01: This is what I have when I open some application, or folder, lets for example use Safari.
Image 02: When I place the cursor over the green button it shows the Full Screen icon.

Image 03: Once I click on the green button, it goes to Full Screen, taking the whole screen.

Image 04: Here's the state where I come back coming out of Full Screen (or the original state when I opened Safari).

Image 05: When I option+click the green button changes to a plus ➕ sign.

Image 06: Once I option+click the window expands only to it's natural borders, leaving space to actually 'see' the rest of the screen.

Image 07: Conclusion, my question is: Is there a way to by default have this functions inverted?
Just for fun, imagine that my left hand is always occupied (unavailable) 😉

I wouldn't like to have an external App to do this though. Thank you in advance.