Closing a menu with clicking on random place. Currently we have to re-click the extra deck to close the extra deck preview while in duel. (same with graveyard, banished, xyz material preview, etc.)
Just use ESC. We cannot close it when clicking anywhere else because clicking anywhere else also causes another action. It’s not easy to create a separate hitbox for this. There are several things on the field and in the game state. ESC is the global close for anything.