If you have accounts you no longer use, you can make them inactive. This way, you can add the ones that you want.
Lastly, you can run an Account QuickReport to view all the transactions associated with your account. To do this, you can follow the same steps above. This time, you'll need to select the Run report option.
You can always leave your comment below if you have follow-up questions or clarifications about managing your accounts in QBO. I'll be here to lend a hand. Enjoy your day.