Explain the problem as you see it
Sometimes I have a node that I want ot put underneath another node, to make it the child of that node. Currently, you have to actually open the parent node, clicking on the node to expand it. Only then can you drag the child node into it.
Why is this a problem for you?
It's a problem because it means I have to mouse away from one node, click on the other node to open it, mouse back to the node I want to make a child, and then drag it into the open parent node. All of this takes a bit of time and clicking, whereas if I could drag the child node onto the parent node, it would be one movement - job done!
Suggest a solution
It would be much quicker and easier, if you could just drag the child node on top of the parent node and it automatically makes it a child. I.e. how they do it in Notion. It's a nice touch, UI-wise.