Are you trying to remove an app that you have installed on your store? Or is it a sales channel that you added, and now want to remove? To remove apps you can simply navigate to the Apps section of your admin, and click Delete next to the app you want to remove:
If you want to manage your sales channels, and remove some that you aren't using, then you can also navigate to Settings > Sales Channels and click Remove next to the sales channel you want to deactivate. Just be careful about removing things like the Online Store sales channel (which is essentially your storefront that customers visit) as removing that could cause issues such as making some of your apps stop working, even after re-adding the channel.
If you can give me some more information on what you are trying to do, and the name of the specific app/sales channel - I'd be happy to help you figure out how to remove it! If you need any more context on what I explained above, then you can feel free to check out our help docs on Removing Apps and Removing Sales Channels. All the best!
Rick | Social Care @ Shopify - Was my reply helpful? Click Like to let me know! - Was your question answered? Mark it as an Accepted Solution - To learn more visit the Shopify Help Center or the Shopify Blog