[pjvsvsrtrxc]

Seamless mode still exists in Virtualbox 6.1 which is the latest version.

(Windows did just crash when I was testing it but, as it also crashed twice before I got that far, I don't think it's related)

[janci]

Did Windows 10 start to crash in VBox for you too? I had to move to libvirt/qemu as I was not able to resolve. Downgrading nor upgrading VirtualBox did not help. Removing last windows update helped a little, then it started crashing again.