HOw can I hide transactions before a certain date?

Hello there, @faykagan-gmail-c.

In QuickBooks Online, there's no option to directly hide all the transactions from all of your accounts. If these transactions are no longer needed, you can delete or void them one-by-one. The steps below will guide you through the process. 

1. Go to the Accounting menu on the left panel. Then, choose Chart of Accounts.
2. Click View register beside the account where entries are located.
   
3. Select the transaction/entry you want to delete. Click Delete.
   
4. A message will pop-up asking you to confirm the delete option. Click Yes.

Also, you can select specific dates on how you want the account generate the transactions. Click the Funnel icon and enter the appropriate dates. Then, select Apply.

You'll want to check this article to get more tips and information when voiding and deleting transactions in the program: Void or delete transactions in QuickBooks Online.

You can go back here if you have additional questions about QuickBooks transactions. The Community will be right here for you. Take care and stay safe always.