Gnome Extension Debug: Re-size development Window

When testing my GNOME Extension, I run the command dbus-run-session gnome-shell --devkit --wayland which creates a 1280 x 800 window named “Mutter Development Kit”.

I would like to have a different size: Let us begin with size 720 x 1280 ( Since it will be obvious if the solution works).

I have attempted the following:

  1. Use the mouse cursor to re-size Mutter Development Kit. I do not receive any handles that allow re-sizing
  2. Select the Mutter Development Kit application, hold the alt key, and hit the “F8” function key. I noticed no difference and didn’t see any mouse handles to re-size.
  3. Launch the command
    MUTTER_DEVKIT_WINDOW_WIDTH=720 MUTTER_DEVKIT_WINDOW_HEIGHT=1280 dbus-run-session gnome-shell --devkit --wayland
    these variables have no effect
  4. Launch the command
    GNOME_SHELL_WINDOW_WIDTH=720 GNOME_SHELL_WINDOW_HEIGHT=1280 dbus-run-session gnome-shell --devkit --wayland
    these variables have no effect

To me, a good answer is either:

  1. A request for more information (“can you run $COMMAND and paste the output”)
  2. A Bash command (or sequence of bash commands) which re-size the window
  3. A detailed description of mouse and keyboard clicks used

Thanks in advance!