To navigate to the credit memo listing you have to go to your Invoices > Credit Memos. Here you have a list of all your deposits and credit memos, sorted from most recent to oldest.
Here you can search for credit memos with information in your notes, as well as the customer's name and credit memo identifier.
You can also create useful filters just as you would for your invoices, orders, quotes or contacts. To do so click on "Filters", and select the criteria your filtering for.
This will display everything thats being filtered for, in the example below I'll be filtering for the credit memos of the month of June. You can also save the filter by clicking the "Save as new" button.
Name your filter something relevant, in this example, it will be "June Deposits", if you set the visibility to "Shared", all the other users using the QuoteMachine account will have access to this filter. Don't forget to save your changes.
Once you've saved your filter, you also have the possibility to add it to your dashboard if needed. To do so check out this article.