Most Germans were completely aware of what was happening during the Holocaust. They knew Jewish, gypsy/Romani, LGBTQ, disabled, communist, and trade unionist folks, along with dissenters and criminals and more, were systematically imprisoned, tortured, slaughtered, and entirely dehumanized.
Most Germans also allowed themselves to be desensitized to this; allowed it to be normalized; allowed their ingrained biases and hatred of others to be taken advantage of for this to happen.
Most Germans lived relatively normal lives during the war. They had jobs, families, parties, birthdays, school, homes, and so on. They could ignore what was happening to their fellow humans, and ignore they did.