There are quite of a few openshift apps for different pages, use the new openshiftpageheader component there instead of pageheader. here are some examples

https://github.com/RedHatInsights/ocp-advisor-frontend/blob/a4d68be61334cb625cb2ef03f150cbea41b3619b/src/Components/WorkloadsList/index.js#L4

https://github.com/RedHatInsights/vuln4shift-frontend 

https://github.com/RedHatInsights/uhc-portal/blob/main/src/components/common/PageTitle.tsx