How and why did the function of Auschwitz change as the war progressed?

In January 1945, Auschwitz was overrun by Russian soldiers. It was the largest extermination and concentration camp, to which over a million people had been deported from all over Europe. Upon liberation, only a few thousand prisoners remained. Most of the surviving prisoners had been taken away on death marches.

Explanation:

In addition to the mass murder of well over a million Jewish men, women and children, and tens of thousands of Polish victims, Auschwitz also served as a camp for the racial murder of thousands of Roma and Sinti and prisoners of several European nationalities.

It progressed into a systematic death camp, while at first it was not supposed to be.

Explanation:

the noble might have thought that the system was far because they had lot of things and riches and the serf would have thought that the feudal system was un fair because of the way they were treated.

where is thing if you show me on the map or have a map i can answer your question