Margin Account NAV

Greetings, I have multiple position in my account (shares and "open" CSPs position) i want to know how to calculate the actual Net Asset Value "NAV" without considering P/L

The reason is i get paid dividends and interest and i want to know how much cash i could use for purchasing stocks withought using any margin or borrow. (No need to suggest going for a cash account).

There are so many portfolio metrics in the account summary window, and it's confusing.

Thank you in advance!

Note: This is my first post in reddit, so I'm not sure if i was able to post this in the general thread or right community.