If you are there to genuinely look and learn, with an intention to buy something some day, somewhere, just let them know. Most dealers are understanding.
However, if you are not serious about buying right now, and just looking, they’ll appreciate knowing this too - and/or so they can go help others in the store.
Most are acutely aware of tire kickers and online shoppers. It helps to let them know what you’d like to do. Ya never know, sometimes they can work something out for ya on a purchase -and- offer valuable warranty support later if something goes wrong. My local 56-year-in-business dealer developed loyal customers this way.