Moving elements in browser

VP-UML (Community Edition) shows “move element up” and “move element down” arrow keys in the Model view. However, they are grayed-out and thus don’t work. How do I activate those buttons?

Furthermore, it would be very useful to move Logical view diagrams in the same fashion (move up, move down). But I don’t see any buttons for moving up/down Logical view diagrams. Is there a way to activate that ability?

Ok never mind, I figured it out. I didn’t realize that a “sort mode” was active, preventing me from using the up/down buttons.