Cart Content
You can customize the content and collection in empty state of cart.
Content in empty cart
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Go to Sales Channel > Online Store > Theme> Customize
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In Header > Cart Drawer, click the side arrow to open the accordion.
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You can see the default collections listed there. Click the collection that you want to change.

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Click the change dropdown and select 'Change collection' option
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Select the desired collection from the list
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Click the 'Select' button.
 
Update shipping message in empty cart
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Go to Sales Channel > Online Store > Theme> Customize
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In header, click on Cart Drawer.
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Update the text in 'Shipping Message'

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Click on Save button. And you can see the updated content in cart
 
