It's nice to have you in the Community, @welwyn1021. I can provide clarification on looking at deposits that have already been deposited.
You can review the contents of a deposit anytime by opening it up. For example, you could open it up from the register with the following steps:
The following is a brief video to serve as a visual reference:
Alternatively, you can also run a Deposit Detail Report to locate see information about the transactions.
For additional insight into deposits, such as manually adding funds to the transaction, I recommend the following thread by @Anonymous: How to Record Bank Deposits in QuickBooks Online.
Should you have any questions about deposits or need further assistance, I'm a post away. Hope you have a wonderful weekend.