What is a Draft Status in Invoice ?

By default, when an Invoice is created, it will be saved as Draft.

When the invoice is in draft status, it will not be considered as sale and has no impact in GST filing.

You can filter the invoices by clicking the Outstanding,Overdue and deposit options displayed at the top.
On filtering Draft, you can find the list of drafts which are not invoiced and the total amount to be invoiced.