Alternate way to close the preview window

[DGCK81LNN]

Is your feature request related to a problem? Please describe.
I've been using a LiteLoaderQQNT plugin which replaces QQ 9's builtin image preview window with QuickLook. However, as the QuickLook window does not automatically gain focus when opened, and pressing Esc / Space to close QuickLook only works in Explorer, I have to either move my mouse to the Close button and click it, or click on the QuickLook window and then press Esc to close it, which is very annoying.

Describe the solution you'd like
An alternate way to close the QuickLook window, such as by pressing the middle or 4th mouse button on it.

Describe alternatives you've considered

• It might also be possible instead for the QQNT plugin to implement pressing Esc or Space, while focusing the QQ window, to close QuickLook.
• Another possible solution is to give the QuickLook window focus by default, unless opened from Explorer.

Additional context