Upsell Popup is an important part of the strategy to increase sales and AOV. The purpose of this feature is to demonstrate the benefit of buying a bundle instead of one product individually when the customer adds it to their shopping cart. This feature is enabled by default when the app is installed.
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To disable it, go to the Upsell popup menu on the app dashboard and click 'Settings':
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Then, 'Toggle off' and save the changes: