How to disable Health Bars on NPCs?

I just started here a few days ago and it's been a while since the last time I played WoW, so I can't remember how to do fix some basic stuff.

My issue right now is that, the NPC names now are displaying with a Health Bar, which I don't like, so how do I disable it? I was playing earlier and it wasn't showing but then, they appeared and can't figure out how to turn it how it was before.

Can someone explain me how to do it? Or if I need an Addon, which one will work? I'll really appreciate it :c

menu > interface > names

Look at "unit nameplates" settings.

Btw usually players use some addon to replace the retail "healthbar"

Thank you very much! Now I see the names like it was before. <3

About the Addons... Honestly, I don't know. I played WoW like ten years ago, so I barely remember which Addons I used back then, and now I saw there were a LOT. So I'm pretty lost. But while searching how to disable the HP bar, I saw some Addon recomendations, and I didn't wanted to try.

The only one I've right now is a Quest Helper and a Profession one.

Thanks again, ^^

Some basic addons that might make playing WoW more tolerable.

Dominos / Bartender 4 for action bars (Masque and skins if you want icons to look bit different)
Prat 3.0 for chat
Atlasloot for drop tables, crafting, PvP items, Emblem vendors etc.
Xperl / Shadowed Unit Frames and more for those better looking unit frames.
MoveAnything if you wish to move default Blizzard frames, bags, chat, map etc.
Sexymap for minimap customization.
Recount Lite / Skada for the meters.
Deadly Boss Mods
Mik's Scrolling Battle Text for combat texts.
Power Auras if you want visuals for your skills, like in later retail expansions.

Or get ElvUI for more of an all-in-one UI package, with clean looking UI.
ElvUI covers chat, action bars, minimap, unit frames to name a few.