UE5: Prevent Menu Anchor creating new Window

Unreal Engine | Unreal C++ API

Small but useful tip:
Somewhere along the parent hierachy of the Menu Anchor, one of the Parent’s should override OnQueryPopupMethod and reply with CurrentWindow:

				
						/**
	 * Popups can manifest in a NEW OS WINDOW or via an OVERLAY in an existing window.
	 * This can be set explicitly on SMenuAnchor, or can be determined by a scoping widget.
	 * A scoping widget can reply to OnQueryPopupMethod() to drive all its descendants'
	 * poup methods.
	 *
	 * e.g. Fullscreen games cannot summon a new window, so game SViewports will reply with
	 *      EPopupMethod::UserCurrentWindow. This makes all the menu anchors within them
	 *      use the current window.
	 */
	virtual FPopupMethodReply OnQueryPopupMethod() const override
	{
	    //EG:
	    return FPopupMethodReply::UseMethod(EPopupMethod::UseCurrentWindow);
	}