So when you have several postings on an account then have a jnl to clear some. How do you just show the ones that haven't been cleared? Navigation Lists > Accounting > Accounts then click on the name of the account.

You mean you reverse entries, like you have a debit for $100 and you post a credit for $100? There is no way for NS to know those postings are related, the only exception being AR and AP, where you can apply transactions to each other

So how do you only see the "open" balances and not the massive list?

it is not possible

😥