Increase the Virtual Machine Screen Resolution

In virtual machines with Linux guest operating systems installed, dynamic resolution may not work when increasing the size of the guest OS window or switching to Full Screen mode. It happens because, by default, only 3 MB of video memory are allocated to such virtual machines' video cards. If you need the virtual machine screen resolution more than 1024x768, go to the Video pane of Virtual Machine Configuration and increase the amount of video memory available to the virtual machine's video card up to 16 MB.