SPICE - Proxmox VE
https://pve.proxmox.com/wiki/SPICEEnable SPICE for a VM. Spice is not enabled by default. To enable it set the Display in the Hardware section of the VM to Spice (shown in the screenshot at the top). Increase the memory if you intend to use SPICE with high resolutions. 32 MiB is plenty for 4K resolutions. Caution. Before changing the Display setting to SPICE check the following ...