Hiding the Subversion ALM main menu
By default, a Subversion ALM menu is displayed on the Jira main menubar:
Jira allows disabling (hiding) any element contributing to extend its functionality by an app.
Go to:
Jira > Administration > Manage apps > Subversion ALM > N of M modules enabled
And click on the Disable button for the "Show Subversion on the Jira top menu" element