We've made some updates to where you find the Abandoned Registration Email settings. On July 26th 2022 we will release this update.
Now you can adjust all of these settings in one place (Settings > Email Tab). Along with all of the other email settings. You can also edit the Abandoned Registration Email Template in the new Emails area (Settings > Emails).
Previously, these settings were in Settings > Theme and on the Abandoned Registration List.
If you don't have this feature and would like to learn more please reach out to support.