Edit: None of the answers I got work so I went ahead and filed a bug in KDE bugzilla: https://bugs.kde.org/show_bug.cgi?id=502901
Neither CTRL Q or CTRL W work for me. I set a hotkey for the window operations menu in Settings app > Shortcuts > KWin > Window Operations Menu, but then pressing the close button in the context menu that shows, closes the window of the other window I was focused on and not the debugger.
KDE is an international technology team creating user-friendly free and open source software for desktop and portable computing. KDE’s software runs on GNU/Linux, BSD and other operating systems, including Windows.
If you encounter a bug, proceed to https://bugs.kde.org, check whether it has been reported.
If it hasn't, report it yourself.
PLEASE THINK CAREFULLY BEFORE POSTING HERE.
Developers do not look for reports on social media, so they will not see it and all it does is clutter up the feed.
if
escoralt+f4don't do what you want, try going to window management in settings and making a window rule. you can click thedetect window propertiesbutton then click the offending window and set the window type to match. then you can try using rules like forcing the titlebar on just that window or ignoring global shortcuts or one called 'closable'. i've never used any of these but it's a thought.