There is no way to minimize, expand, or drag the window of any application from the MS Office Suite. It is not working only KDE environment, it is working in any other environment
OS: KDE Neon 5.18 User Edition
KDE: 5.18.2
MS Office is installed via playonlinux 4.2.12

Have you tried using Alt+left-click-and-drag to move or Alt+right-click-and-drag to resize the windows? (these shortcuts are configurable via System Settings > Window Management > Window Behavior > Window Actions)

airdrik wrote:Have you tried using Alt+left-click-and-drag to move or Alt+right-click-and-drag to resize the windows? (these shortcuts are configurable via System Settings > Window Management > Window Behavior > Window Actions)

Thank you, I did not know about the possibility of changing windows size the Alt+right click and drag. But it's still inconvenient. It is more convenient to use standard buttons.