On the equivalent stress result plot. Click on the line between the red and orange squares and drag that line down. At some point you will get it below 400 MPa and you will start to see more colors on the parts.  You can also double click on the number 2972.2 and type 300 and see what that looks like.

A sharp interior corner exists in the geometry and that represents an infinite stress, so the maximum number on the legend was driven up by the elements around that sharp corner. You can find where that is by clicking on the Max flag on the Results toolbar.