Sorry, but I will probably be not using the correct terminology in this post.
I used to be able to open Emacs from my terminal and the terminal process would stay open (I would not be able to navigate anywhere else using the terminal unless I opened a new tab of quit Emacs). It would look something like the following:
MacBook-Pro:~ User$ emacs # and down here would just be open space
But now when I open Emacs, the terminal reverts back to where I can navigate to another directory or whatever:
MacBook-Pro:~ User$ emacs MacBook-Pro:~ User$
However, I prefer the terminal process to stay open which allows me to easily close Emacs when it freezes (by just exiting the terminal) instead of powering off my computer. I am not sure what I did to cause this change in behavior.