Gx axs transmission working right?

Just picked up a gx axs hightower, and was sold on the idea that the electronic "transmission" shifts perfectly under load no matter what because it is keyed to the cog teeth and will wait to the opportune time to shift. Got home to test and realized that the shifter changes position instantly upon button press even when not pedaling. Do I need to turn on or set up the smart delay feature, or is that how it's supposed to work??