This question already has an answer here:

I have lenovo laptop, with windows 8.1 installed. I have installed Virtual box on it, try to install ubuntu 14.04 on virtual box, it install successfully. But it work in 800 X 600 resolution, how can I make it full screen.

Thank you in advance.

marked as duplicate by mikewhatever, Mitch Feb 13 '15 at 17:45

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • Not necessarily a duplicate of the indicated question. The answer might be simply Host+F where Host is the Right Ctrl key by default but may have been changed/customized. – Octopus Dec 18 '18 at 0:37

It is answered here: Is there a way to make a fullscreen on VirtualBox?

You need to install the Guest Edition first and can then simply press HOST+F within the guest for full screen mode.

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