One of the features I wish was part of Age of Empires: Definitive Edition is showing the full map without fog of war before being taken to the end stats screen. It gives players a chance to see how their opponent played so they can be more prepared for the next game.
You can select “All Visable” on the Reveal Map dropdown bar just before you start a game. It might be difficult convincing other players to agree to this though because most of us like the element of surprise. You can watch tons of AOE DE vids, my favorite uploaders are Soigia and Memo Ror. That way you can learn how they do it.