====== zoom.us meeting and other QT applications scale on hidpi screens on Linux ======
QT applications might show up tiny on your screen if your computer has a Hi-DPI screen (like many notebooks do today). to fix this you can add the following one-liner to a file in ''/etc/profile.d/qt-scaling.sh''. please note you need root rights to edit this file. 

  export QT_DEVICE_PIXEL_RATIO=2