@Carla Kelley-Gonzales. So how did make out?
I also want to modify the number of layers from 6 to 5. I have looked at the suggestion from @David Anderson to simply delete all layers and start with a fresh first layer. Here is part of David's answer.
«One workflow I found was to create the initial slide layers at the beginning of the project. They're blank layers but they enabled me to set up the base layer tabs and add then copy the first round of triggers (pause timeline, move group, show layer if...). That helped me focus on specific triggers as I copied and pasted.»
Unfortunately, I don't have it all figured out in my head and I work in a non-english version.