La fonction de suggestion automatique permet d'affiner rapidement votre recherche en suggérant des correspondances possibles au fur et à mesure de la frappe.
Interestingly enough, there still appears to be no native way to change this icon. You can change the avatar that appears, for bots, but not the chat bubble itself. I wonder if this is because HubSpot has tested this and knows this icon performs best.
You may be able to insert a different icon on the front-end using javascript but that could be risky. YMMV.