Some features in Structure are designed as modules and can be safely turned off. You can do so to remove unnecessary functionality, or limit the exposure of Structure plugin to the users.
If your aim is to limit the exposure of Structure, consider restricting permissions to specific groups of users - see Gradual Deployment.
While it is easy to disable a Structure module, we don't recommend to touch any modules except those listed in this article to ensure stability of Structure and your JIRA application.
To turn off a module:
You can always turn the feature on later by clicking the Enable button.
Effect of disabling this module
Activity streams provider and Structure-related updates are removed from the following places:
Structure section is removed from the issue page.
Structure tab is removed from the issue details panel on the Agile board.
Users will not be able to install synchronizers, and installed synchronizers won't run. You will need to restart the plugin to have settings make full effect. (Disable plugin, then enable plugin.)