On the vCenter server > Cluster/Host > Updates -> Baseline tab is missing and only Image tab is visible
vCenter 7.x
vCenter 8.x
When the cluster is configured to use images at the time of creation or if the cluster is updated to use image, we can use either baseline or images for updates but not both.
If the cluster is configured to use only Images, Baseline tab won't be visible and this is an expected behaviour.