Some VMs have "VMware EVC" entry in "Configuration" tab, while others do not.
The following is the situation in which "VMware EVC" is not displayed.
VMware vCenter Server 7.0.x
VMware vCenter Server 8.0.x
VMware vSphere ESXi 7.0.x
VMware vSphere ESXi 8.0.x
"VMware EVC" entry in the VM's Configuration tab is a entry available for VM's hardware version 14 or later.
Upgrade the virtual machine's hardware version to 14 or later according to Upgrading a virtual machine to the latest hardware version (multiple versions).
If you only need to check the EVC mode of VMs without setting per-VM EVC, you can use the workaround below to verify it.
Workaround:
Use the following PowerCLI cmdlets to check the EVC mode for each VM.
Get-VM | select Name,HardwareVersion,@{Name='EvcMode';Expression={$_.ExtensionData.Runtime.MinRequiredEVCModeKey}}