After expanding the PVC to increase the disk size, the size gets updated in PVC and it's details but not in the VM --> Configuration --> Storage --> Disks page. This shows the old size only. The size is reflected inside the guest also in lsblk output. 

OCP 4.17 / CNV 4.17.3  

Always

1. Create VM with root disk or additional disk
2. Expand the disk using GUI 
    Expanding virtual machine disks
    https://docs.openshift.com/container-platform/4.17//virt/virtual_machines/virtual_disks/virt-expanding-vm-disks.html
 3. Check VM disks page again for the size. 

disk size is not changed in summary of disks

disk size should reflect in VM summary page