Hi,
Sorry to say but quick links (or shortcuts, or whatever you call them) in Multi Commander are very badly designed.
I've added Desktop and Downloads, clicked Save (seriously? why would I not want to save it?), but despite saving after restarting MC they disappear, the widget still shows only drive C and D.
This is what I mean: i.ibb.co/GFwYzMB/image.png
I also cannot drag'n'drop my own custom folders to this widget and there is no way to add them, seems I can only add the folders that are in the dropdown.