As you build your app, you may start adding some stuff that you end up not using, which can make the application heaver over time. We just added a way to scan your application and delete unnecessary data types, reusable elements, styles, etc. which will help keeping things clean and improve page load performance. In particular, this option will also remove properties on elements and actions that aren’t used in practice (for instance, if you started setting some gradient colors on an element, and then decide to use a plain color background, these properties aren’t used but still use some space).
You can find this option in the Settings Tab, General section at the bottom. When you click on this button, a popup will show what can be cleaned, so you’ll get another chance to cancel.
Note that when you use this feature, you lose some information (types are deleted permanently, styles are removed, properties that aren’t used will be back to the default value). You can revert using version control if you realize you created some issues/want to keep some information.