VirtualBox window doesn’t scale up to full-screen

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Sometimes my VirtualBox doesn’t scale up to full-screen and bloats to a very unpleasant stretched mode when I try to maximize the window it.

How do I fix it?

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This normally happens when the Graphics controller configured in VirtualBox Display settings isn’t supported. PS : Guest Extensions needs to be installed for this option to work properly. So install them from VirtualBox website (as per Host OS you have installed VirtualBox upon).

To fix this issue, stop the instance of VirtualBox Guest OS you wish to up-scale to full-screen.

Graphics Controller ==> VBoxSVGA

See settings at link below

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