virtualbox.org

Hi all,

My new 4K display supports 3840 x 2160 (16:9) resolution

Please advise how to set Guest display resolution? Thanks

Regards

Well, first of all I would suggest changing it manually, since your question is a bit unclear. However, if you want it to fill the entire screen, you should install Guest Additions. That gives your computer some cool stuff AND your resolution gets auto-set. You can read about how to install it and what it is here.

https://www.virtualbox.org/manual/ch04.html