Lock buttons in TLB right click menu

Is there the check mark at the left of "Lock Buttons" menu item?

Some TLB users guess the buttons are locked when they can't to move items inside menu/toolbar. But when the buttons are locked the drag&drop is not started when you try to move items. If the drag&drop is started but the item stay where is was when you drop it, this is the "auto-arrange": right-click the menu/toolbar, select "Arrange Icons By" submenu and turn off "Auto Arrange".