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I failed to cut a box out of another box, and couldn't figure out why. What did I do wrong?
https://screencast.autodesk.com/Embed/Timeline/bc38d3f4-37af-4077-82f4-d1865cf7b825
From your video, I saw you selected XZ plane as the sketch plane which is on the same plane as the bottom face of box, so it cut the box by default. And then you dragged the manipulator backward, it made no intersection with the box. You can orbit the view port to get clear view of you model when modeling.