If you resize the standalone Casting Bar vertically, you'll see there is an NPC casting bar below it. You can resize it by casting a long spell such as Call to Home, then move your character before it finishes casting. Or you can use the window manager to show a resizable "ghost" of the casting bar on the screen. There's plenty of info on the Casting Bar help page about this.
Also if you'd like to get into more detail about NPC spellcasts, there is the NPC Spell Monitor which watches and reports on spells cast in combat in real time. Use the icon on the XP bar to open the NPC Spell Monitor, or press [Shift+Ctrl+T].
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