Hey there! Hello!
So, not sure if there's actually a button to "close out" a window to where you're able to reopen it again without having to go to where the file is located or go to recents in your application. Keep in mind that I'm on a MacBook, but I have worked on a Windows computer before.
One thing you can do is minimize the window. Your program will remain open, but your window will remain out of your way until you decide to expand it again. This seems to be the closest thing possible to your description, but if you had something else in mind, I'd love to hear more details.
This won't be a good solution if you're looking to cut down on the energy that certain programs may be taking up while open, even if you're not using them. But in terms of getting the windows off your desktop, minimizing is the way to go. It also allows you to have documents/windows out of the way while still being able to work on other documents/windows in the program (i.e. Microsoft Word, Google Chrome, Pages, etc.)
Hope this helped you out! Feel free to ask me any additional questions you may have. :-)
