Virt-viewer is an app for connecting to KVM/QEMU virtual machines (the kind we use).

download from here https://virt-manager.org/download.html

After installing we need a few more things for the fancy USB and filesharing stuff on windows clients:

usb redirect https://www.spice-space.org/download/windows/usbredirect/usbredirect-x64-0.13.0.msi

webddav https://www.spice-space.org/download/windows/spice-webdavd/spice-webdavd-x64-latest.msi

guest-tools https://www.spice-space.org/download/windows/spice-guest-tools/spice-guest-tools-latest.exe

In the VM:
enable spice video driver
apt install spice-vda spice-webdavd