Why you could not find it
The game does not use the word "helmet" for this. The toggle is called Hide Headgear, it is a per-slot control on the Appearance screen rather than an option in the settings menu, and searching the settings for "helmet" returns nothing — which is why this is one of the most-asked questions about the game and one of the least-answered in text.
You do not lose the stats
This is the part worth stating plainly, because it is the reason most people hesitate. Hide Headgear suppresses the head armour’s model. The armour stays equipped and every stat on it keeps applying — you are hiding a mesh, not taking off a piece of gear. There is no defence cost to playing without a visible helmet.
What the Appearance screen controls
Five slots take an appearance. Two pieces of equipment do not participate at all, which surprises people who go looking for a way to reskin them.
- Outfits transmogrify the look of a slot without touching its stats.
- An outfit’s appearance only renders while that slot actually has armour equipped — an empty slot shows nothing, not the outfit.
- Necklaces and rings are equipment but are not part of the appearance system.
- A separate display setting controls whether you see other players’ custom appearances during a match.
- An Appearance Reset option clears every customisation at once.