Issue Summary

Typically after adding a new user or upgrading Confluence, users will be presented with a popup. These popups contains a summary of what's new in Confluence or with introduction details. Some administrators prefer that this page is not displayed to users.

This was something that could be disabled previously but no longer works with Confluence 9.X:

• How to skip the onboarding page (welcome.action) for new users in Confluence Data Center
• How to Turn Off "What's New" Window

Workaround

Add the below property in <installation-directory>/bin/setenv.sh(setenv.bat in Windows) and Restart Confleunce. 

Please refer Configuring System Properties on how to add it . 

CATALINA_OPTS="-Datlassian.darkfeature.benefits.modal.disable=true ${CATALINA_OPTS}"