How to Crop video in Export Window?

In the old versions and a few updates prior, there used to be 2 tabs in the top left corner of the export window, which had "Source" and "Output". Under the "source" tab, you had a crop icon that used to let you crop the who video to a custom size. For example, if your main video is 1920x1080, there you could export in 1000x900 if you wished. This new size cut out portions of the video frame and the new output video would look like a video that has its frame cut out, not the video becoming smaller in size. This cropping method literally cut the frame. In the new update, I can't find this option. Has it been removed or moved somewhere?