You can see your bank account balances in a few different places in Restaurant365:
GL Account Detail Report
Check Register Report
On Bank Transaction Screen
GL Account Detail Report

In 'My Reports', under Financials, there is a GL Account Detail report. Here you can see details and the balance as of the date the report is run for.
Check Register Report
In 'My Reports', under Banking, there is a Check Register report. Here you can see the recent detail and current balance. Then run the Check Register Report.
On Bank Transactions Screen

When you open an new bank transaction (Withdrawal or Deposit), the current balance is shown on the screen.