As of March 2nd, 2020, the Instagram platform will be deprecating its API. This will directly affect the Instagram feed section in all WordPress & Shopify themes. Read more on how it affects your theme here: https://fuelthemes.net/important-notice-instagram-feed-removal/

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I want to remove the Shop / Cart icon.

The cart icon is added when the WooCommerce plugin is active. Simply disable the WooCommerce plugin from your Plugins page.