I'm having the same problem as you. Where is the deleting docker image (checkbox)? Also, What are the my templates you are talking about?
This has been addressed many, many times here on this forum, including in the announcement thread for the upgrade.
Please search the forum for "layers from manifest". I just did and got 30 results.
See the link in my sig about how to search this forum.
Even though Squid has already replied, I am posting this anyway in an attempt to help people help themselves.