Yes, if you move off, it does collapse which is very different behavior to all other UI. I always assume if I click something, I shouldn't have to do something else. As you can see, when you click the middle panel shifts to the left, but the left panel stays open.

This thingy:

When you click on it, you are sent to some random selection in the list

RobertWC:

In the API Explore there is a paper clip thingy. When you click on it, the list randomly goes to some other API category.

I'm not sure what you're referring to. Could you share a screenshot showing where you're seeing a "paper clip thingy"?

RobertWC:

Left panel will not collapse - but it moves center over to the left:

Have you tried moving your mouse cursor off of the menu to allow it to collapse? As long as your mouse is hovering over the menu it will stay open so you can use it. That behavior is unchanged from the old site. Please reply back with further details if that's not the behavior you're reporting.

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Left panel will not collapse - but it moves center over to the left:

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