DataCenter/Cluster compatibility level 4.6 has been introduced in oVirt 4.4.6 (BZ1933974), but it was not set as default compatibility level on new installations, because it requires CentOS 8.4 (or CentOS Stream 8) with Advanced Virtualization 8.4 (libvirt >= 7.0.0). So in oVirt 4.4.7 compatibility 4.6 will be set to Default DC/Cluster upon new installations
Verified on: ovirt-engine-4.4.7.4-0.9.el8ev.noarch Cluster with Compatibility level of 4.6 present by default in new RHV installation
This bugzilla is included in oVirt 4.4.7 release, published on July 6th 2021. Since the problem described in this bug report should be resolved in oVirt 4.4.7 release, it has been closed with a resolution of CURRENT RELEASE. If the solution does not work for you, please open a new bug report.