The release overview of Version Sync for Jira has the same function as the Jira Releases screen. The important difference is, that it refers not only to the issues in this project but to all issues which are in the synced versions. 

This is how you navigate to Releases – Version Sync for Jira.

The Releases – Version Sync for Jira menu item is only displayed when the project is in a Version Sync group.

Jira Software, Jira Service Management: Navigate to Project > “Releases - Version Sync” in the left navigation

Jira Work Management: Navigate to Project > Apps in the top navigation > Releases - Version Sync

Navigattion bar left to Releases Version Snyc