To uninstall Instant from your Shopify store, you can uninstall the Instant App directly from Shopify.
From your Shopify admin, click Settings > Apps and sales channels. Click the app that you want to view. To remove the app from your store, click Uninstall app. Otherwise, click “I'm using this app” to dismiss the notification.
We recommend downgrading your plan and unpublishing any layouts created with Instant before proceeding. This helps ensure there are no leftover files in your currently active Shopify theme. Learn more about downgrading Instant plans and cancelling subscriptions here.