In order to keep only your newly-created icon, simply move the old icon to the App Library. If you already had the app on your home screen, you will now have two icons. In the text field, rename the app as you want it to appear on the home screen.From the drop-down menu, select Take Photo, Choose Photo, or Choose File, depending on where your replacement app icon image is located.Tap the down facing chevron at the top next to 'Open App'.Use the search field to find the app you want to change the icon of, then select it in the list.Tap Add Action, then use the text field to search for Open App.Launch the Shortcuts app on your iPhone or iPad, then tap the + icon in the top-right corner of the screen.Shortcuts can be a complex app to use, as it allows users to create multi-step processes to run on their device, but in this instance, the Shortcut only involves one basic component. How to Change an App's Icon With Shortcuts
If you want to skip to the section where we go step-by-step on how to customize your App Icon using Shortcuts, it's at timestamp 3:58.
