Marcia,
Thanks for the additional info. After I read your first reply to Susan, I checked and found that my eBird app was not the updated version (I thought it updated automatically, but not big updates like this). I have now updated and see how the new version works.
The tip about Hide is useful. I assumed "Hide" was to hide the checklist from eBird output, like for sensitive species or locations.
With respect to deleting checklists you have submitted through the app, even on the old version deleting a checklist only deleted it from the phone. I have deleted them from my phone over time to save space on the phone, and they didn't delete from my checklists online. The reverse is also true, I did a dummy checklist on my phone today to test the new version of the app and then deleted it from my checklists online. Even though it was gone, it was still on my phone, so I had to delete it there separately. This means the checklists on your phone that have already been submitted are not synchronized with your checklists on eBird.
I also found that if you start a checklist and don't pick a specific location at the front end (using the pin icon at the top of the species screen), once you Stop and go the next screen (where you choose the type of checklist, number of people, etc., you are asked to choose a specific location, and if you hit Continue without doing so, it makes you do it before proceeding.
I think we'll get the hang of the new version pretty quickly.