How to Exclude an Account Balance from the Overall Balance

To exclude an account balance from the overall balance, you need to create a new accounts group and include only those accounts whose balance you want to consider, and use this group instead of the "All Accounts" group.

To create an accounts group, press the + button on the accounts screen and select New Accounts Group. You can then collapse the "All Accounts" group by pressing the triangle icon and disable its balance display (context menu/long press).