Escape key should close subwindows
                    It would be convenient if Zotero's sub-windows could be closed simply by pressing the Esc key. A typical example of such sub-windows is the settings window (Edit → Settings).
In fact, some of them, but perhaps not those directly provided by Zotero, can be closed using the Esc key, for example those that allow the user to select a file (e.g., Edit → Settings → Advanced → Files and Folders → Choose...).
                            In fact, some of them, but perhaps not those directly provided by Zotero, can be closed using the Esc key, for example those that allow the user to select a file (e.g., Edit → Settings → Advanced → Files and Folders → Choose...).
 Upgrade Storage
 Upgrade Storage
About Ctrl-W, it doesn't work here (GNU/Linux Mageia 9, KDE/Plasma) but I can resort the old good Alt-F4 :)
@edervishaj: Which find window/dialog, exactly, and which OS? On macOS, with Zotero in full-screen mode, Esc closes the Find panel in the reader, and a second Esc is needed to exit full-screen mode. In the note editor, Esc does exit full-screen mode in addition to closing the Find toolbar. We'll see if we can fix that.