To get All Accounts Balances, Navigate to Accounting → Accounts
In that page, you will see all Accounts with current balances including how it's calculated.
Your current balance = ( Equity + Total in ) - Total out
Take this for an example-
You have created an Account with name "A" with initial Balance $120. And then, you have spent $10 to pay a server bill. And then you have received an amount of $400.
So your current balance would be-
Equity (Initial balance): $120.00
Total in: $400.00
Total out: $10.00
Your current balance = (120.00+400.00)-10 = 510