Hey 👋
Once you’ve missed this prompt you’ll have to manually do the customisation, this includes the icon pack which you can get from here, you can then enable it by long pressing on the home screen > customisation > Icon Pack. Widgets can be accessed by long pressing on the home screen > widgets.
You also have the option to change things like app grid, app labels and the search bar via long pressing on the home screen > customisation > home screen layout.