Where is the filter on my Whirlpool Quiet Partner II dishwasher?

Where is the filter on my Whirlpool Quiet Partner II dishwasher?

I have a Whirlpool Quiet Partner II model DU1055XTVD It has started making a very loud humming noise almost as soon as I turn it on and hasn’t been washing the dishes as well as before. I was trying to see if maybe the filter was dirty, but I don’t know where it is. In all the videos I see online the filter can easily be seen and taken out, but on my dishwasher I don’t see anything like that.