1. Look at the account register. Open Chart of Accounts, click the account, and view the register. There's a checkmark column that shows a transaction's status: blank means not cleared, C means cleared, R means reconciled.
2. Clearing happens two ways. Either by checking a transaction off during the formal Reconcile process against a statement, or by clicking directly in that checkmark column in the register to mark something cleared ad hoc, without running a full reconciliation.
3. Reconciled is the status after that. When a reconciliation finishes (the difference hits zero and you click Finish now), every transaction that was checked off during that reconciliation flips from C to R. Reconciled transactions are also locked against casual editing in a way cleared-but-not-reconciled ones aren't.
4. Your cleared balance is a running total. It's the sum of everything marked C or R as of today, which is the number QuickBooks and most banks use as the quick sanity check against what the bank currently shows, separate from your full book balance that also includes things like an uncashed check.