You need to set a schedule to capture a cart/order as abandoned.
Go to Abandoned cart > Settings > General, enable and set schedules to capture guests and/or members’ abandoned cart/order.
Then, if your site visitors enter your site and leave their email and/or phone number, but have not completed checking out, after this schedule, the cart/order will be captured as abandoned.
Record an abandoned cart when leaving an email address and /or phone number on the email popup
Record an abandoned cart when leaving an email address and/or phone number in the checkout field on the checkout page
