U-shaped cut

First you need to choose the side on which the U-shaped cutout will be built.

1) Specify the indent BEFORE the cutout, then the width and depth of the cutout

2) Specify the radius of the inner left and right corner.

3) If necessary, trim the cutout, specify the edge.

4) "Add" button

Also under all values you can see their allowable limits (mm - min/max).