Solved: Screen remains in 4:3 on Windows 10 in VirtualBox

[GoldenPlaya3]

I have installed Windows 10 Pro on VirtualBox as the title suggests (haven't activated it yet). However, I am unable to make changes both from Windows settings and virtual machine settings. Even when I try to change the screen resolution from the View menu, it doesn't seem to change as if it is stuck at a certain resolution. When I attempt to change it from Windows settings, only 4:3 resolutions are available.