Hello, Dana! Welcome to planDisney and thanks for your question!
With your Park Hopper tickets, you only need to make a
theme park reservation for the park you want to start at each day. Then at 1:00 p.m., you can hop to the other park. Your reservation will show up online and on the Disneyland app as "All Day" as that's just how the system displays all theme park reservations. You will have no problem hopping over to the other park with your Park Hopper ticket.
Have you looked into the new
Disney Genie+ feature? Disney Genie+ allows you to select the next available return time for an attraction and then skip most of the wait by using the Lightning Lane. It is available for $20 per day, per ticket. If you didn't already add this option at the time you bought your tickets, you'll be able to add on Disney Genie+ each day you are in the parks by using the Disneyland app.
I hope your trip to the Disneyland Resort is filled with magic and memories!
-Linda