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To change the footer navigation menu, check out this useful resource:
See an example on the following screenshot:
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I'm unable to change the footer navigation menu on the warehouse theme. Has this been removed?
Sophia here from Shopify. It looks like you might need to update your theme. Take a look for your theme's version under Online Store > Themes > Customize by clicking the three dots near the top left. In older versions, this could be under Online Store > Themes > Customize > Theme settings instead. The version I've just added to my test store is 1.18.3.
In this version of the theme, the footer menu is found under Footer > Links. Depending on your screen size, this section will either appear on the left side of the theme editor, or over on the right. Here's a screenshot example of each view:
If for any reason you cannot update your theme right now, I recommend contacting our support team through the Shopify Help Center so we can take a look at the theme editor with you. Since this is a third-party theme, we might need to put you in touch with the theme developer for further support. You can also contact the developer directly if you need any help with the Warehouse theme.