Confirming a Quote turns it into a Sales order (SO) which is added to the bottom of Open table of Sales orders tab in the Sell screen with a Delivery status of Not shipped.

Once converted to a SO, it will start participating in Stock reservations for items in the order.
Confirm Quotes individually or in bulk
Mark a Quote status as Confirmed either from a Quote card or in the Quotes tab from the Sell screen.
Changing the status of a single Quote:
Open or create a new Quote.
Change the Status from Pending to Confirmed.
Quote turns it into a SO and is added to the bottom of the Open table for Sales orders.
Change the status of Quotes in bulk:
Navigate to the Quotes tab in the Sell screen.
Individually checkmark Quotes or bulk select.
Select Bulk actions and choose Confirmed from the Status section.
You can also revert a Confirmed Quote back from a SO to a Quote if needed.