How do I get a window to stay where I leave it on screen?

Rcovering from deleted preferences little by little and today I would like to restore a behavior where I could leave a window on screen that I use over and over while opening and closing multiple other document windows. The way it is now, after resetting preferences, the window in question keeps locating itself in alignment at the top of the screen with a newly opened window. How do I keep the window I use over and over to stay in a position on screen where I leave it?

TIA, Ken