If, for any reason, you need to uninstall a sales channel integration, click on the My Apps tab. A list of all your integrated apps will be displayed. Choose the sales channel you wish to install, and you will see an 'Uninstall' button on the top right-hand corner of the page or the bottom of the page.
Do check if the sales channel you are uninstalling requires additional uninstallation steps before you remove the app from QuickBooks Commerce. For example, if you wish to uninstall Shopify, you will need to disconnect your store's link before the 'uninstall' option is available.