If Seamless Mode option is grayed out or not working in VirtualBox, you need to install Guest Additions image and disable 3D Acceleration.

Learn how to run Windows on Linux using VirtualBox. This step-by-step guide covers setup, optimization, and seamless integration.

If VirtualBox displays a black screen & is not booting the guest OS or not opening the installation window, you need to disable Hyper-V and 3D Acceleration.