Hi,
I can access "Toggle Editors" through Crtl+Shift+P keybaord hotkey (As attached screenshot 1) and then, I can see what an average Joplin user see a split windows including a note view and a mark down editing view, but when I clicked on "Toggle Editors" button as in your screenshot (or as in attached screenshot 2), it came back to the problematic note view. So, the user experience of this incident becomes tricky, so I would not call this a final solution, just so you know.
Attached screenshot 1:
Attached screenshot 2:
