It may be the case that a project or subset of users in JIRA may need the subversion commits tab and another project or subset of users does not. It is not immediately obvious how to configure such access to the tab.
The tab is displayed based on the permissions associated with the user viewing issue, project, et cetera.
To restrict the tab to selected projects or users, simply configure the appropriate project/group of users to either have or lack the View Version Control permission.
Article ID: JIRAKB231932754 https://support.atlassian.com/browse/JSP-63506