I know how to remove the title bar of an application window in KDE plasma. But by doing that, the three buttons responsible for closing the application, minimizing the application window, and reducing and maximizing its size get removed. Is there any way of removing the title bar but keeping those 3 buttons?

Hi!

You just want to 'clean' eveything but those 3 buttons? You candrag and drop them as you want them to have using SystemSettings → Appearance → Window Decorations → Titlebar Buttons