Replace the account greeting
Configure Replace the account greeting under Settings → POM Tweaks → White labelling → Admin bar. Enable it and click Save to reveal Account greeting.
Enter plain text with %s for the current user's display name, then save again. The greeting applies in site administration and the visible frontend toolbar while preserving the account's profile link, avatar, and submenu. An empty greeting preserves the existing title. Disabling the control keeps the saved greeting available for reuse.
See Configure toolbar logout, greeting, and visibility for supported tokens, independent controls, verification, and troubleshooting.