If you hit Receive and have a Lightning address enable it will show up as an option among the tabs at the bottom of the screen.
The point of a Lightning address is to allow people to make payments to you without action on your end, you generally just give it to people in advance or have it on your social media profile.
Got it. Still feels a bit opaque though. Why not jump directly to this screen with the added option to create a custom invoice next to the other 4 options. Creating a custom invoice is a feature for more advanced users that are accustomed to working with lightning. My two sats.

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