Why do I have to isolate objects for a classification model?

With classification — why do we isolate objects? is that required?
What if I don’t isolate objects but export… what happens?

We use the isolate objects step to create classification datasets from object detection datasets. The isolate objects step works great with the 2 step detection process, where we first detect where in an image the object is, then crop it out and then pass it to a classifier.
We can also create a classification project with the full image. By exporting the data in the Open AI Clip Classification format. However that format is designed for single label classification. If the images your exporting contain multiple classes then use Multi-Label Classification CSV format