The new modern language tooling that we've been building for Positron (new Jupyter kernel Ark, new formatter Air) have been built without a lot of support for this kind of "hanging" indentation. You can read a bit more about this in the Air context here:
If you are really committed to that hanging indentation, that might be a reason to stick with RStudio for now, because it does have formatting support for that style along with Enter behavior that is better for that style.
If you are interested in sticking with Positron, you would probably want to move over to a style like:
adds a non-trivial amount of bloat the the code when using many of these operations. I left a comment in the issues page but will continue with this style unless something changes.
I also thought it was interesting that co-pilot suggestions always use the hanging indent (as in the GIF), but maybe that's just due to it learning my own coding style (if that's a thing!)