You’re right—you can move it, but only in a weird way: you have to hold it, drag it around, and then drop it. Just exactly same like you do.
It’s definitely not the normal method, and this quirk has been around for a long time.
But to get the “Drag n drop from sidebar to main list” to succeed, you first have to create a blank node right next to the target node in the main list, then drag the item from sidebar and drop it onto that nearby newly created blank node.
I cannot screen record, but I can screenshot for you.
