Using Ubuntu 20.04 on a three-monitor display (Left-1440x900, Centre-1920x1080, Right-1440x900). After a fresh install, I opened the System Monitor app and it appeared in the left monitor with the top quarter of the window outside the top of the screen. I could not use the mouse to access the title bar to move the window, nor access the window control buttons. I used Alt+F7 to with the arrow keys to move System Monitor into full view. Note: The monitors are displaying the correct resolution - the mouse stops at the tops and sides of the screen Question: Where in the filesystem does the OS store the information about where to display a window (in this case System Monitor) and the size of that window?
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Assuming stock Ubuntu 20.04 with Xorg Server and Mutter window manager.
Window-positioning keyboard shortcuts (best and quickest solution candidate):
The first task is to get the mis-positioned window focused. You can get it focused by using the Alt+Tab cycle, or, in some configurations, through clicks on the app's icon in the dock.
With the window focused, the combination of a modifier key + arrow keys can position it such that it gets resized to the active monitor's exact size.
This modifier on 20.04 by default is the left Super key (the left "Windows" key).
(On older releases, the modifier was the Alt key, and in 20.04, through user preferences, Alt can still be made that modifier. But it's not the default any more.)
Super + up arrow will maximize the window size on the active monitor.
Super + left / right arrows will move the window to the corresponding side of the active monitor.
Again, each of these will resize the window to match the active screen's size.
Bonus:
Super + shift + left / right arrows will move the window to the next adjacent monitor. (This however will not resize the window, and will keep its disturbing offset, even if on the other monitor.)
Full-window-area click-drag:
Holding down a modifier key during a click-dragging mouse gesture makes the entire surface of the window available for click-dragging (not just the header).
This modifier key used to be Alt on older releases, and left Super (the left-side "Windows" key) on recent releases. Try both.
Tweaking the system monitor app's window geometry through gsettings API:
(Note: this is not available for all apps. System monitor however has this feature.)
gsettings get org.gnome.gnome-system-monitor window-state
and
gsettings get org.gnome.gnome-system-monitor maximized
seem relevant.
But both of these seem to get updated every time you close the system monitor window. So after you have already recovered the window to a usable position with mouse, or cursors, or anyhow, there is no point in setting these; they will just get updated again.
With that said, here is a command capable of restoring the window; from the above it can be seen that it has to be issued while there is no window open for system monitor:
gsettings set org.gnome.gnome-system-monitor window-state '(1000,800,50,50)'
Subsequently starting the app should place the window with the prescribed geometry.
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