Many people have a good reason to require a treeview control but there isn't one included with the standard controls for the platform.
There are a few 3rd party ones but not everyone wants to use such controls.
Wouldn't it be good if Microsoft released such a control? After all, they have such a thing in their own apps.
Well, good news, such a control is coming.
There's a preview among the samples on GitHub. You'll find it at:
If you want to use it you'll need to get the whole repository because of the way some of the project files are shared amongst various samples.
It's not a simple control and it's written in C++ so that may be an issue for you but it seems pretty robust to me.
It provides customization over indentation (staggering) and whether folders can be collapsed and expanded. IT also supports the dragging of items between folders. As shown in the image here.
It can also be easily styled. And not just the icons, as below.