What is the Void or change button on the selling screen for?

It opens every order of today and yesterday, counter sales, tables, QR tables and online orders, with a Today and a Yesterday count. Open one and there are three doors: Payment changes how it was paid, to another way, Split: two methods, or pay later on a house account; Refund gives money back on a paid sale; Void cancels it, paid or not, with every payment going back the way it was taken. Each asks for a manager's four numbers on the spot without the cashier signing out. The POS and the counter tab in the docs describes Void or change.