What is the purpose of the “little down arrow” next to many different functions in word

The can be used to paste text in any order

Jessie has received a contract to build a real-time application for a baker. however, the baker doesn't want to invest too much money. his only requirement is that he wants the customers to know which cupcakes are available at what time and in what quantity. so his core requirement is that the details of product should be in real time. what platform can jessie use to develop this application?

Which option allows you to view slides on the full computer screen?