Haha, damn ok, it's been so long since I've had to do this, I didn't realize it is now possible (I used to want this all the time and was the bane of my existence in the late 90s early 2000s when using Mac). You still can't seem to move files into sibling directories, though, only to directory links in the sidebar. Anyway, I LEARNED SOMETHING TODAY (about macOS dialogues and about testing things before I open my mouth).

++edited to clarify language.++