Bambu Studio, big rectangle support?

Whenever I use Bambu Studio there is a big rectangular support off in the back that it built that has nothing to do with the model being printed and it doesn’t show in Bambu Studio. What is the purpose of this? It feels like a huge waste of material but I am completely ignorant (newbie) so maybe it’s doing something I don’t yet appreciate.

Disable the Prime tower in the slicer settings.

https://wiki.bambulab.com/en/software/bambu-studio/parameter/prime-tower

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