This setting is enabled in Git Integration for Jira Cloud app by default.
This setting is turned off by default in Dev Info for Jira Cloud app.
Show Git Roll Up Issue Tab
The Git Roll Up Issue tab displays a summary of the files, lines and the developers who made the changes in the commits commits associated with the Jira issue. Enable/disable this setting to allow the Git Roll Up tab on the Issue page for all Jira projects.
For more details, see Features: Git Roll Up tab (Jira Cloud).
The View developer tools permission is required to view the Git Roll Up Issue Tab. Jira users must also have the Browse Project permissions to a project associated with a repository to view.
After all the settings have been configured according to your requirements, click Update to apply the changes.