Lister created as a menu bar and it gets sucked into top of window

I have a lister I want to keep close to the top of my window. As I try to place it the top of the window sucks it to the top and expands it all the way across the window. I'm sure it has to do with a border cushion. I just don't know if the action is from the window or the Lister Menu.

Do you mean the window is being maximized (like almost any window will be if you drag it to the top of the screen in Windows 7 or above), or that one Opus window is being docked to another, so they become joined as a single dual-display window?

It acts as two magnets would when you get to close to the edge of the screen.

If you're talking about a Lister window getting maximized when you drag it to the top of the screen, that's a standard Windows feature and every other resizable window will behave the same.

If you're talking about a floating toolbar (not a Lister) docking when you drag it to the edge of the screen, you can override this behavior by holding down the Shift key while you drag it.

I also found, Toolbar/options:
Allow floating Toolbars to be docked with edge of screen.

Thanks for the help. The Shift key sounds like a better solution.