Age of empire 3 complete edition: Can we play both expansion at the same time?

So i installed age of empire 3 complete edition, but when i launch the game, I can either "play Age of empire 3 complete edition", "Age of empire 3 : The war chiefs" or "Age of empire 3 : The asian dynasties".

I was wondering how can I play the content of both expansion at the same time.

Does whatever option i choose, i will get all the content of all the expansion (map, civilization, unit, game mechanic) and its just the campaign of that expansion that wont be available, or do I have to choose a particular launch option like the latest expansion that will also load previous expansion content?

Age of The Empires 3: The Asian Dynasties includes the The War Chiefs expansion pack. If you select "Play Asian Dynasties" you will get all DLC.