First, open the Command Prompt in Windows (make sure you are logged into an Administrator account on Windows). You can do this by opening the Start Menu, and typing "command prompt" into the Start Menu search bar. Then, type the following command into the Command Prompt.
cd "C:\Program Files\Oracle\Virtualbox"
This command will change the focus of the Command Prompt to the program folder for Virtualbox (if you installed Virtualbox somewhere different, then change the command to wherever you installed it). Next, type in this command:
vboxmanage setextradata "Name of virtual machine" "CustomVideoMode1" "1920x1080x32"
This command activates "vboxmanage", a command-line program included with Virtualbox that allows you to edit the properties of your virtual machine, including its built-in resolutions. Replace "Name of virtual machine" with the name of your virtual machine (in the screenshot below, my virtual machine is named "Mountain Mac 2"). Replace "1920x1080x32" with whatever resolution you're using.
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