When you don’t see "AD FS application activity" under Usage & Insights, it might be due to the time it takes for data to sync. https://learn.microsoft.com/en-us/entra/identity/enterprise-apps/migrate-ad-fs-application-howto
Ensure that Entra Connect Health is correctly installed and configured on both your AD FS and domain controller servers.
https://learn.microsoft.com/en-us/entra/identity/hybrid/connect/how-to-connect-health-adfs