AskHistorians

It's likely that Hitler viewed what we call WW2 (as in, the period of Allies/Axis fighting between 1939-1945) as just a stage of a much larger war against non-Aryans. Lebensbraum ("living space"), realized as territorial expansions, was the core belief of Nazism and tied directly with their ideas of racial superiority. Hitler & co. considered it their right to take land from the untermensch of the world.

[I originally typed out about 700 other words here, got way too off topic, and realized most of what I wasn't relevant.]

It's also worth mentioning that Hitler was pretty amped on amphetamines for most of the "World War 2" chapter of his life. His ideas for post-war Germany were... childlike, in a way, unoriginal, unrealized, and broad. You'd struggle to find many sources who can say with much specificity "After the war, Hitler wanted X,Y, but not Z." Broadly speaking, most of Hitler's thoughts on a post-WW2 world (because there was no scenario where Nazism Germany hadn't become the dominant world superpower) involved an impenetrable Nazi German Empire making up the bulk of central Europe, with neighboring territories acting subservient to Germany. Inside that empire, life would be pretty similar to German society on the eve of the war: extreme racial social stratification and compulsory/instructed nationalism.

Oh yeah and he wanted to build a bunch of huge buildings