A limited subset of standard objects that are non-customizable do not appear in Field Utilization results. This is because Salesforce does not provide field information for these objects when they are returned in a metadata extract.

If you'd like to further understand the standard objects that currently do not show field data in the Field Utilization dashboard, we invite you to review the table. Keep in mind that the table may not be exhaustive and some standard objects may only appear when certain features are enabled.